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Original Series[]

Episode Original Aliens Used Clock's Aliens Used
And Then There Were 10 Heatblast, Wildmutt, Diamondhead, XLR8 Ghostfreak, Four Arms (selected alien was Ghostfreak)
Washington B.C. Heatblast, Grey Matter, Four Arms, Stinkfly Four Arms, Stinkfly, XLR8
The Krakken Four Arms, XLR8 (selected alien was Ripjaws), Stinkfly, Ripjaws Ghostfreak, XLR8, Diamondhead, Ripjaws
Hunted Diamondhead (2x), Ghostfreak, Grey Matter Heatblast, Upgrade, Diamondhead
Kevin 11 Ben: Ghostfreak, XLR8, Stinkfly, Heatblast (selected alien was Four Arms), Four Arms (selected alien was Stinkfly)
Kevin: Heatblast, Four Arms
Clock: Wildmutt, Diamondhead (selected alien was XLR8), XLR8 (selected alien was Stinkfly or Ghostfreak)
Kevin: Diamondhead, XLR8
Secrets Diamondhead (3x, first time dream), Upgrade (2x), Heatblast (2x), Stinkfly, XLR8 (2x), Wildmutt (2x), Four Arms, Grey Matter, Ghostfreak (2x), Ripjaws Stinkfly (2x, first time dream), Ghostfreak (2x), Wildmutt (2x), Diamondhead, Ripjaws (2x), Upgrade, Heatblast (2x), Four Arms (2x), Grey Matter, XLR8, Cannonbolt
Framed Ben: Diamondhead, Wildmutt (selected alien was Upgrade), Four Arms
Kevin: Four Arms, Heatblast (2x), Stinkfly (3x), Upgrade, Diamondhead
Other: Stinkfly, Diamondhead, Upgrade, Ripjaws (news article)
Clock: Cannonbolt, Four Arms, XLR8
Kevin: Four Arms (3x), Wildmutt, Stinkfly (2x), Diamondhead (2x), Ghostfreak, XLR8 (2x), Upgrade, Ripjaws, Heatblast
Other: Ripjaws, Four Arms, XLR8
Camp Fear Cannonbolt (selected alien was Stinkfly), Wildmutt, XLR8, Wildvine, Stinkfly Wildmutt (2x), Heatblast, Wildvine (selected alien was Ghostfreak), Four Arms
Ghostfreaked Out Ben: Ghostfreak (selected alien was Heatblast), Four Arms, Grey Matter
Dream: Wildmutt
Clock: Ghostfreak (selected alien was Upgrade), Cannonbolt (selected alien was Upgrade), Grey Matter, Heatblast
Dream: Stinkfly
Grudge Match Diamondhead, Four Arms, Grey Matter, Upgrade, Cannonbolt XLR8, Wildmutt (selected alien was Four Arms), Grey Matter, Upgrade
Dr. Animo & The Mutant Ray Ben: Stink Arms, Diamond Matter, Heat Jaws
Bat: Heatblast
Worms, Crab, Max: Stinkfly 
Clock: Diamondblast (selected alien was Diamondhead), Mutt Arms, Stinkgrade
Bat: Wildvine
Worms, Crab, Grandpa: Wildmutt
Back with a Vengenace Upgrade, Grey Matter (8x), Diamondhead (4x), XLR8 (6x), Heatblast (5x), Wildvine (3x), Wildmutt (4x), Ripjaws, Stinkfly (6x), Four Arms (3x), Cannonbolt (2x) Wildvine, XLR8 (5x), Grey Matter (2x), Stinkfly (2x), Heatblast (3x), Four Arms (2x), Diamondhead (2x), Cannonbolt
Clock 10,000 Ben 10: XLR8, Stinkfly (selected alien was Four Arms), Upgrade (selected alien was Four Arms), Cannonbolt, Diamondhead
Ben 10,000: XLR8 (3x), Four Arms (3x), Spitter (2x), Diamondhead (2x), Buzzshock, Cannonbolt, Wildmutt, Heatblast, Stinkfly, Arctiguana
Connor 10: Four Arms, Wildvine (selected alien was Diamondhead), Heatblast, Cannonbolt, XLR8, Diamondhead
Connor 10,000: XLR8 (2x), Humungousaur, Spitter (2x), Shocksquatch, Goop, Armodrillo, Four Arms, Upchuck, Brainstorm, Gutrot, Buzzshock, Arctiguana
Wildvine (selected alien was Stinkfly), Blitzwulf, Cannonbolt Wildmutt, Blitzwulf (2x)
Under Wraps Four Arms, XLR8 (2x), Wildvine, Wildmutt, Diamondhead (2x), Upgrade (selected alien was Snare-Oh) Four Arms, XLR8, Wildvine, Blitzwulf, Wildmutt, Cannonbolt, Heatblast, Snare-Oh
The Return Stinkfly (selected alien was Four Arms), Snare-Oh (selected alien was Heatblast), Cannonbolt (selected alien was Four Arms), XLR8 XLR8, Upgrade (selected alien was Diamondhead), Heatblast, Diamondhead
Be Afraid of the Dark Grey Matter (selected alien was Heatblast), Upgrade, Frankenstrike, Cannonbolt Grey Matter (selected alien was Heatblast), Upgrade, Frankenstrike, Diamondhead
The Visitor Wildmutt, Heatblast, Wildvine, Diamondhead, Four Arms, Upchuck Frankenstrike, Four Arms, Upchuck
Divided We Stand Ripjaws, Ditto (3x, first time selected alien was Stinkfly), Upgrade (selected alien was Ditto) Stinkfly, Ripjaws, Ditto (3x, first time selected alien was Diamondhead), Wildvine
Secret of the Omnitrix Heatblast/Eye Guy/XLR8, Stinkfly, Wildmutt (2x, selected alien was XLR8), Diamondhead, Grey Matter (selected alien was Stinkfly), Upchuck, Four Arms, Cannonbolt, Way Big Eye Guy, XLR8 (2x), Ripjaws, Snare-Oh, Ditto, Grey Matter, Ghostfreak, Cannonbolt, Way Big
Hippocra-10 Ben 10,000: Four Arms (4x), XLR8 (4x), Cannonbolt (2x), Heatblast, Diamondhead (2x), Spitter, Arctiguana, Snare-Oh, Way Big
Ken 10: XLR8, Buzzshock (2x), Wildvine, Grey Matter (2x), Ditto, Spitter
Clock 10,000: XLR8 (3x), Jetray, Brainstorm, Heatblast, Diamondhead (2x), Spitter, Arctiguana, Humungousaur (2x), Overflow, Snare-Oh, Four Arms, Cannonbolt, Frankenstrike, Rath, Way Big, Atomix, [REDACTED]
Hippocra-10: Buzzshock (2x), Shellhead (2x), Grey Matter, Toepick (2x), XLR8, Ditto, Wildvine, Spitter

Alien Force[]

Episode Synopsis Ben's Aliens Clock's Aliens
Clock 10 Returns It's been five years since you removed the Omnitrix. A normal life has suited you thus far. That is, until you find Geralt has gone missing, as well as having uncovered a secret plot by an ancient alien race to destroy all life in the universe. Swampfire, Echo-Echo, Humungousaur Jetray, Swampfire, Humungousaur
Everybody Talks About the Weather The search for Geralt and your quest to stop the Highbreed leads you to a farm where you discover a young Pyronite, the same species as Heatblast. Jetray, Swampfire Swampfire, Chromastone
Kevin's Big Score While working on Geralt's Rustbucket, Kevin makes a break for it, stealing the camper. Perhaps he's not so turned from his criminal past after all. Big Chill (2x), Echo-Echo Goop, Brainstorm, Big Chill
All That Glitters You meet a young man named Michael Morningstar, who claims to be a member of the Plumbers. However, he takes a suspicious interest in Taryn. Humungousaur, Chromastone, Jetray Humungousaur, Spidermonkey, Swampfire
Paradox The abandoned military base of Los Soledad is home to a monster that destroys everything it touches, and a mysterious and curious British man. Chromastone, Swampfire, Jetray, Humungousaur Clock 10: Echo-Echo, Big Chill, Humungousaur, Spidermonkey
Clock 23: Power Stone, Dog-Nabbit, Muck-Amuck, Crystallo, RADI8, Windy Hindy
Geralt Out While searching for Taryn's brother Ken, you come to an unsuspecting hatchery where the DNAliens and a Highbreed leader are conducting their work, as well as an unexpected reunion. Humungousaur, Big Chill, Jetray Spidermonkey, Big Chill, Goop
Pier Pressure While on a date with Julie, you're ambushed by a strange creature that reminds you of Upgrade. Brainstorm (selected alien was Jetray), Jetray, Humungousaur Chromastone, Big Chill, Brainstorm
Plumbers' Helpers During a fight, Kevin is kidnapped by a Kineceleran girl and Tetramand boy, XLR8 and Four Arms' species respectively. Big Chill, Swampfire Big Chill, Humungousaur, Echo-Echo, Jetray, Brainstorm
X = Clock + 2 While attempting to keep the peace with the war-loving Incurseans, you finally transform into your tenth transformation: Alien X. Alien X, Swampfire Alien X, Humungousaur, Chromastone, Big Chill
Darkstar Rising While getting in legal trouble with the Plumbers, as well as trouble with an unprovoked Highbreed, a threat returns to take their revenge. Chromastone, Goop, Humungousaur (2x), Jetray, Spidermonkey, Echo-Echo Spidermonkey, Chromastone, Alien X
Good Copy, Bad Copy In a sense of deja vu of what happened with Kevin five years ago, your aliens are off doing things you haven't done, and you're getting the blame for it. Ben: Big Chill, Humungousaur, Goop, Swampfire, Brainstorm, Jetray, Chromastone
Albedo: Humungousaur (2x), Jetray (2x), Big Chill (2x), Goop, Echo-Echo, Spidermonkey
Clock: Jetray, Big Chill, Echo-Echo, Humungousaur
Albedo: Jetray, Big Chill, Spidermonkey, Swampfire, Humungousaur, Goop, Chromastone
Alone Together A freak accident causes you to wind up on a desert planet with a Highbreed. Echo-Echo, Big Chill, Swampfire (2x) Big Chill (2x), Swampfire (2x), Echo-Echo, Humungousaur, Spidermonkey
War of the Worlds The time has come for the final assault on the Highbreed as they make their march on Earth. Taryn and Kevin have assembled a team, while Azmuth has given you more power than you know. Cannonbolt, Jetray, Swampfire (2x), Upchuck, Way Big, Brainstorm, Humungousaur, Lodestar Clock 10: Slapback, Spidermonkey, Humungousaur, Brainstorm, Shocksquatch, Atomix, Alien X
Fusion Clock: Heatblastrodactyl, Waymungousaur, Gravadactyl
Clock 23: Speedyquick, Rollaway, Giant-Manster, Mr. Mummy 
Skurd: Chromastone, Big Chill, Diamondhead, Astrodactyl, Wildvine
Vengeance of Vilgax Your arch enemy Vilgax has returned, once again hellbent on taking the Omnitrix. With only a limited number of aliens available, Kevin decides it might be best to find a "way around" your limits to defeat him. Ben: Jetray (2x), Cannonbolt, Upchuck (selected alien was Humungousaur), Brainstorm, Swampfire, Big Chill, Humungousaur, Chromastone (selected alien was Way Big), Diamondhead
Lost: Chromastone, Spidermonkey, Goop, Way Big
Clock: Astrodactyl, Cannonbolt (selected alien was Humungousaur), Shocksquatch, Eye Guy (selected alien was Shocksquatch), Snare-Oh (selected alien was Spidermonkey), Lodestar (selected alien was Big Chill), Swampfire, Chromastone, Diamondhead, Goop, Squidstrictor (selected alien was Atomix), Atomix, Alien X
Lost: Slapback, Lodestar, Big Chill, Atomix
Simple An alien girl contacts you and your team to come help her planet, which is currently ravaged by a racially powered civil war. Jetray, Lodestar (selected alien was Humungousaur), Spidermonkey, Humungousaur, Swampfire, Goop, Way Big Goop, Spidermonkey, Big Chill, Simpleten, Humungousaur, Atomix
Alien Swarm In an attempt to intercept a shady business deal with alien technology, you discover a plot by a mysterious man named Victor Validus to enslave the Earth. Big Chill (selected alien was Spidermonkey), Humungousaur, Nanomech Big Chill, Heatblast (selected alien was Spidermonkey), Astrodactyl, Lodestar, Humungousaur, Spidermonkey, Nanomech
Busy Box A piece of technology that defies the normal rules of your universe's tech crashes in town, and it has no problem mimicking your every move. Ben: Humungousaur, Spidermonkey, Swampfire, Lodestar (selected alien was Humungousaur)
Naljian Destructor: Humungousaur, Spidermonkey, Swampfire, SwampMonkeySaur
Clock: Nanomech, Upchuck (selected alien was Alien X), Lodestar
Naljian Destructor: Nanomech, Upchuck
Singlehanded An alien bounty hunter comes for the Omnitrix. During your battle with him, you somehow end up in the Null Void, but the hand on which you wear the Omnitrix is gone. Spidermonkey, Humungousaur (2x), Big Chill, Swampfire, Jetray, Diamondhead (selected alien was Swampfire or Humungousaur), Goop, Brainstorm, Echo-Echo Nanomech (2x), Wildvine, Simpleten, Decagon Vreedle, Diamondhead, Brainstorm, Way Big
The Con of Rath A trip to deliver a peace treaty results in you becoming trapped in the form of a new alien, one which seems to attack almost anything that breathes. Rath (2x) Rath
The Final Battle Two threats have teamed up to take you down, and take your Omnitrix as well. The fate of the galaxy lies in your hands, but so does the fate of those closest to you. Ben: Big Chill, Jetray (3x), Humungousaur, Swampfire, Ultimate Swampfire
Albedo: Diamondhead, Swampfire, Spidermonkey, Rath, Humungousaur, Ultimate Humungousaur
Bioids: Humungousaur, Lodestar, Diamondhead, Spidermonkey, Swampfire
Clock: Spidermonkey, Humungousaur, Big Chill (2x), Swampfire, Ultimate Swampfire, Ultimate Big Chill
Albedo: Squidstrictor, Chromastone, Rath, Eye Guy, Snare-Oh, Humungousaur, Ultimate Humungousaur
Bioids: Atomix, Brainstorm, Rath, Goop, Chromastone, Jetray
Save the Last Dance Something's going weird with one of your aliens. Perhaps it's deja vu of the days of Ghostfreak? Big Chill (3x, second time selected alien was Jetray), Jetray Big Chill (3x, first time selected alien was Jetray, second time selected alien was Chromastone), Jetray, Chromastone

Ultimate Alien[]

Episode Plot Ben's Aliens Clock's Aliens
Fame After your secret identity has been revealed to the world, you discover that a rogue, unidentified species has been stealing parts from NASA. Humungousaur, Jetray, Chromastone, Spidermonkey (2x), Ultimate Spidermonkey Simpleten, Ultimate Simpleten, Jetray, Shocksquatch, Ripjaws
Duped Your responsibility to the world as a hero, to your friends, and to yourself has lead you to realize you can't be everywhere at once... Or can you? Normal Ben: Rath, Echo-Echo (2x), Cannonbolt, Lodestar
Arrogant Ben: Echo-Echo (2x), Upchuck
Empath Ben: Echo-Echo (2x), Humungousaur, Big Chill
Normal/First Clock: Rath, Slapback (2x), Cannonbolt, Ultimate Cannonbolt
Second Clock: Spidermonkey, Ultimate Spidermonkey, Humungousaur, Ultimate Humungousaur, Slapback 
Third Clock: Rath (2x), Ultimate Rath, Slapback
Video Games You've been approached to be scanned for a Clock 10 video game. At the same time, though, a strange robot has arrived that seems to counter all your abilities. Four Arms (2x), Humungousaur (2x), Nanomech (2x), Jetray (2x), Spidermonkey (2x), Swampfire (2x), Cannonbolt (2x), Big Chill (2x), Lodestar (2x), Way Big Spidermonkey (2x), Jetray (3x), Humungousaur, Echo-Echo, Nanomech, Rath (2x), Lodestar (2x), Shocksquatch (2x), Cannonbolt (2x), Ultimate Cannonbolt, Chromastone (2x), Way Big
Escape From Aggregor After thwarting a plot of Dr. Animo's, you learn your town is under seige by a rampaging alien turtle, just as unidentified a species as Bivalvan. Four Arms, Brainstorm, Big Chill, Ultimate Big Chill Nanomech, Shocksquatch
Too Hot to Handle Kevin unintentionally finds P'andor, one of Aggregor's prisoners. He claims that he "wants out." Out of what, exactly? Well... Humungousaur, Ultimate Humungousaur, Jetray, Water Hazard, Big Chill, Cannonbolt, Ultimate Cannonbolt Jetray, Ultimate Jetray, NRG, Water Hazard, Cannonbolt
Andreas' Fault The Forever Knights are acting strange, stealing materialistic objects that they'd otherwise never steal. As it turns out, one of the escaped prisoners of Aggregor is involved. As well as a certain rat... porcupine... possum... It's Argit, alright? Spidermonkey, Jetray, Goop, Swampfire Wildvine (selected alien was Echo-Echo), Humungousaur (2x), Armodrillo, Brainstorm (selected alien was Rath)
Fused Ra'ad, the last of Aggregor's escaped prisoners, attacks you in your home. When trying to figure out exactly why, you're attacked by Aggregor, and find you only have access to one transformation. Jetray, AmpFibian, Brainstorm Spidermonkey, Ultimate Spidermonkey, AmpFibian, Shocksquatch (selected alien was Rath)
Ultimate Aggregor You're informed by a Plumber scout that Aggregor has been found in Los Soledad, using Paradox's old technology for some unknown purpose. Big Chill, Ultimate Big Chill, Swampfire, Ultimate Swampfire, Nanomech, Humungousaur Astrodactyl, Slapback (4x), Rath (2x), Big Chill,  Humungousaur, Chromastone, Spidermonkey
The Map of Infinity After a defeat by Ultimate Aggregor, you're informed by Azmuth and Paradox that he is after the Map of Infinity, a four-piece object capable of sending its user anywhere in existence. And for better or worse, someone from your past has shown up to help, albeit unintentionally. Humungousaur, Big Chill, Echo-Echo, Ultimate Echo-Echo, Four Arms, Cannonbolt Present Clock: Slapback, Ultimate Slapback, Big Chill (2x), Ultimate Big Chill, Chromastone, Jetray (2x), Water Hazard, Diamondhead, Humungousaur, Brainstorm
Past Clock: Heatblast (2x), Arctiguana, XLR8, Stinkfly, Four Arms 
Deep Searching for the second piece of the Map of Infinity sends you Piscciss, the homeworld of Ripjaws' species. Goop (2x), Humungousaur, AmpFibian, Big Chill (2x), Ultimate Big Chill Present Clock: Big Chill, Ripjaws (3x), Upchuck, Astrodactyl, Goop
Past Clock: Ripjaws, Stinkfly
Where the Magic Happens The third Map piece is located beyond a sealed, magic door, and only one of your villains knows how to enter. Four Arms, Jetray, Cannonbolt, Chromastone, Humungousaur, Ultimate Humungousaur Present Clock: Wildmutt, Frankenstrike, Way Big, Four Arms, Diamondhead, Terraspin
Past Clock: Humungousaur, Big Chill, Decagon Vreedle, Rath, Atomix, Terraspin
Perplexahedron The final piece rests within the absolute unit of an artifical planet known as the Perplexahedron. Humungousaur (selected alien was Chromastone), Ripjaws, Spidermonkey, Swampfire, Cannonbolt, Ultimate Cannonbolt Present Clock: Jetray, Ultimate Jetray, Big Chill, Ultimate Big Chill, Chromastone, Swampfire
Past Clock: Arctiguana, Ripjaws, Feedback, Spitter
The Forge of Creation With Aggregor having obtained all the Map pieces and all hope seems gone, you find yourself with no choice but to go to the Forge of Creation, home of the Celestialsapiens. Present Ben: Alien X, Terraspin, NRG (selected alien was Big Chill), Four Arms, Swampfire, Ultimate Swampfire
Past Ben: Heatblast, Wildmutt, Four Arms (selected alien was Upgrade), Stinkfly
Present Clock: Alien X, Lodestar, Brainstorm
Past Clock: Upgrade, Blitzwulf
Absolute Power After defeating Aggregor, Kevin has gone power hungry, once again having become a maddened mutant monster from the energy he's absorbed. You and Taryn want to try to bring Kevin back, but your past self is not so sure that's an option this time. NRG (2x), Chromastone, Terraspin, Nanomech, Way Big, Lodestar, Humungousaur, Big Chill, Spidermonkey, Echo-Echo, Ultimate Echo-Echo Present Clock: Armodrillo, Jetray (2x), Ultimate Jetray (2x)
Past Clock: Grey Matter, Atomix (2x), Feedback (2x), Feed X
Hero Time A public scandal sends you into an unintentional rivalry with another hometown superhero. Spidermonkey, Jetray, Armodrillo, Humungousaur (2x), Rath (selected alien was Jetray), Four Arms, Ultimate Humungousaur, Goop, Water Hazard (selected alien was Big Chill) Nanomech, Heatblast, Armodrillo, Humungousaur, NRG (selected alien was Jetray), Eye Guy (selected alien was Jetray), Rath, Frankenstrike (selected alien was Rath), Goop
Greetings From Techadon A constant stream of robots known as Techadons attack, and each one seems to be more powerful than the last. Brainstorm, Goop, Rath, Echo-Echo, Ultimate Echo-Echo Clock: Lodestar, Upchuck, Nanomech, Way Big, Armodrillo, Water Hazard, Diamondhead
Kevin: Ripjaws
Double or Nothing You and your team attend an uncannily accurate (and somewhat of a parody) show called "Clock 10 Live" to see what's going on. Ben: Armodrillo, Water Hazard, NRG (2x), Spidermonkey (2x), Ultimate Spidermonkey (2x), Echo-Echo, Ultimate Echo-Echo
Albedo: Rath
Clock: Frankenstrike, Big Chill, Atomix, Chromastone, NRG (unintentional)
Albedo: Galvan (3x), Astrodactyl, Echo-Echo, Big Chill, Rath, Atomix
Above and Beyond The Plumber's Kids are sent a distress signal by Magister Patelliday: he's on an abandoned space station being attacked by Clockwork Firefly. Humungousaur (2x), Echo-Echo, Goop, Rath Big Chill AmpFibian, Tranquillizer, Armodrillo, Ripjaws, Ultimate Ripjaws, Rath (2x), Echo-Echo, Ultimate Echo-Echo
Clock 10,000 Returns A signal from the Ultimatrix brings you to a warehouse which holds an artifact out of time: The Hands of Armageddon. An ancient being known as Eon is after it, and it seems you have another helping hand this go around. Ben: Spidermonkey, Goop (selected alien was Rath), Way Big, Swampfire, Ultimate Swampfire, Jetray
Ultimate Ben: Ultimate Humungousaur (2x), Heatblast, Arctiguana, Clockwork (2x), Spidermonkey, Big Chill, Diamondhead, XLR8
Clock: Wildmutt, Chromastone (2x), Goop, Slapback, Ultimate Slapback
Ultimate Clock: Crashhopper, Clockwork (2x), Big Chill, Chemarro, Way Big, XLR8, Ultimate Armodrillo, Diamondhead, Gravattack
Couples Retreat When Taryn insists on returning to Ledgerdomain to try to help a rogue Charmcaster, you find that the magical villain has obtained an... interesting accomplice. Jetray (2x), Fasttrack, Four Arms, Diamondhead, Humungousaur (2x), Ultimate Humungousaur Clock: Snark Tanque, Jetray, Ultimate Jetray, Fasttrack, Spitter, Arctiguana, Ghostfreak, Alien X
Darkstar: Alien D
Prisoner Number 775 is Missing After Area 51 is destroyed, it is revealed to have an alien prison underneath it with 774 alien prisoners inside. Wait, that can't be right, there's supposed to be 775... Swampfire, Big Chill, Rath (selected alien was Humungousaur), Echo-Echo (selected alien was Humungousaur), Humungousaur, Wildmutt, Ultimate Wildmutt, ChamAlien Big Chill, Rath (selected alien was Big Chill), Sandbox, Blitzwulf, Snakepit, ChamAlien
The Ultimate Sacrifice You lose control of an Ultimate Form during a fight, and it results in you being trapped inside the Ultimatrix, where your Ultimates reside. Ben: Humungousaur, Ultimate Humungousaur (2x), Ghostfreak, Heatblast, Brainstorm, Diamondhead, Way Big
Ultimates: Cannonbolt, Swampfire, Big Chill, Humungousaur, Spidermonkey, Echo-Echo

Clock: Big Chill, Ultimate Big Chill, Ultimate Jetray, AmpFibian, Ultimate AmpFibian, Arctiguana, Ultimate Arctiguana, Armodrillo, Ultimate Armodrillo, ChamAlien, Ultimate ChamAlien, Wildmutt, Ultimate Wildmutt, Ultimate Ripjaws, Ultimate Cannonbolt, Ultimate Swampfire, Ultimate Humungousaur, Ultimate Spidermonkey, Ultimate Echo-Echo, Ultimate Rath, Ultimate Slapback, Goop, Antigravitesla, Slapbolt, Toepick, Heatblast, Captain Clockwork, Ultimate Clock
Ultimate Clock: Ailen X
Ultimates: Cannonbolt, Swampfire, Big Chill, Humungousaur, Spidermonkey, Echo-Echo, Jetray, Rath, Ripjaws, Slapback, AmpFibian, Arctiguana, Armodrillo, ChamAlien, Wildmutt

The Night of the Living Nightmare You wake up one night to find yourself alone. Entirely alone. The entire neighborhood is barren, except for many of your fallen enemies. What could be going on here? Ben: NRG, Four Arms, Goop, Ultimate Spidermonkey, Lodestar, ChamAlien, AmpFibian, Fasttrack
Albedo: Fasttrack, ChamAlien, Big Chill, NRG, Brainstorm
Inspector 13 Following up on the events from Greetings from Techadon, a Techadon Weapon Master arrives and kidnaps you, intending to use the Ultimatrix to enhance the Techadons. Ben: Echo-Echo, Terraspin, Rath
Gwen: Diamondhead, Clockwork, Humungousaur, Upchuck, Rath
Kevin: Jetray, Wildmutt, Way Big, Nanomech, AmpFibian
Heroes United A monster of a mechanical marvel appears from a mysterious portal and attacks. It manages to get you through the portal, where you find yourself in an alternate world where no one knows you, and rather than aliens, E.V.O.s run amuck, one of which going by the name of Rex Salazar. Ben: Humungousaur, Diamondhead (3x), Lodestar, Rath (2x), Big Chill (4x), Cannonbolt (2x), XLR8, Four Arms, Shocksquatch, Upgrade, Upchuck
Alpha: Heatblast, Four Arms, Humungousaur
Clock: Upgrade
Alpha: Swampfire, Spidermonkey, Atomix
When in Rome... A tussle with the Forever Knights in Rome leads you to the first piece of an ancient puzzle. Terraspin, Echo-Echo, Humungousaur, Ultimate Humungousaur Terraspin, Echo-Echo, Humungousaur, Rath
Awful Tower You head to France after hearing of Null Void monsters attacking. There, the ancient mystery thickens. Water Hazard, NRG, Swampfire, Ultimate Swampfire
Devil's Advocate A signal interference causes Azmuth to believe the next piece of the Potis Altiare is in Wyoming. Specifically, at Devil's Tower. Armodrillo, Humungousaur, Spidermonkey, Ultimate Spidermonkey
Terra-Caught Off Guard Taryn detects that the next Potis Altiare piece is located somewhere along the Great Wall of China. Swampfire, AmpFibian, Big Chill, Ultimate Big Chill
Tokyo Nights Cooper sends you a distress signal, claiming he's under attack in Tokyo and for you to come alone. Armodrillo, NRG, Spidermonkey, Ultimate Spidermonkey
Amazon Prime You're given a map to the last two pieces of the Potis Altiare. Your first of these last two stops: the Amazon Rainforest. AmpFibian, Big Chill, Echo-Echo, Ultimate Echo-Echo
On the Rome Again You return to Rome to obtain the last (or first?) piece of the Potis Altiare. However, you find it in the posession of a jealous superhero. Terrapin, Armodrillo, Swampfire, NRG
Shin To'kustar The evil To'kustar lands in Tokyo. It's up to you to reach him and finish this fight once and for all. Ben: Water Hazard, Spidermonkey, Humungousaur, Way Big
Albedo: Way Big
Clock: Way Big
Albedo: Way Big, Ultimate Way Big


Episode Plot Ben's Aliens Clock's Aliens
The More Things Change When Taryn and Kevin leave so the former can focus on continuing her proper education, and Charmcaster having to return to Ledgerdomain, you find yourself being a lone hero for the first time since you began. Things aren't so different, though, still plenty of alien conspiracies and secrets and plots to kill you. Present Ben: Lodestar, Spidermonkey (selected alien was Humungousaur), Cannonbolt, Bloxx, NRG (selected alien was XLR8), Water Hazard (selected alien was Humungousaur), Terraspin, Armodrillo, Shocksquatch
Young Ben: Four Arms, Feedback
Zed: Crabdozer, Buglizard
Present Clock:
Young Clock: Feedback
Zed: Crabdozer, Buglizard
Trouble Helix A flashback sequence of events reveals the origins of a foe known as Malware. Present Ben: Chromastone, Cannonbolt
Young Ben: XLR8, Feedback, Four Arms (selected alien was Diamondhead), Heatblast, Cannonbolt, Diamondhead
It Was Them Following an attack by another monster, you believe the threats to be connected to Dr. Animo. Ben: Diamondhead, Echo-Echo (selected alien was Swampfire), Rath (selected alien was Swampfire), Crashhopper
Zed: Slamworm, Mucilator
Clock: Crashhopper
Zed: Slamworm, Mucilator
So Long and Thanks for all the Burgers A mysterious and dark ship enters Earth's atmosphere. You find out that the ship belongs to an ancient, fifth-dimensional species, and that it houses a universe-threatening device. Crashhopper, Grey Matter (selected alien was Rath), Spidermonkey, NRG, Alien X Alien X
Of Predators and Prey The monster-related threats come to a head when you find out the person behind them: Khyber, an alien huntsman bent on taking your Omnitrix and hanging it on his wall. Present Ben: Stinkfly (2x, selected alien was Humungousaur), Wildmutt (2x, selected alien was Humungousaur), Crashhopper (2x), Armodrillo (2x, selected alien was Humungousaur), Heatblast (2x), Ball Weevil, Rath, Humungousaur, Grey Matter (selected alien was Way Big), Big Chill
Young Ben: Stinkfly, Feedback
Zed: Crabdozer (2x), Buglizard (2x), Mucilator (2x), Slamworm (2x), Terroranchula, Tyrannopede
Phil: Terroranchula
Present Clock:
Young Clock:
Phil: Terroranchula
Outbreak During a training session, the Plumbers Base becomes under attack by a mysterious Cerebrocrustacean, a member of Brainstorm's species. He escapes, but not before jeopardizing the Omnitrix. Ben: Wildvine, Humungousaur, Walkatrout, Pesky Dust, Mole-Stache, The Worst, Kickin Hawk
Rook: Upchuck
Psyphon: Heatblast
Liam: Humungousaur
Bubble Helmet: Shocksquatch
Fistina: Upgrade
Clock: Puffertrip, Pesky Dust, Portaler, Mole-Stache, The Worst
Bubble Helmet:
Malefactor While being the reluctant victim of a dunking tank at a town festival, Khyber's predators attack. Present Ben: Brainstorm, Wildmutt, Spidermonkey, Stinkfly, Humungousaur (3x), Heatblast (2x), Armodrillo, Big Chill
Young Ben: XLR8, Feedback
Zed: Buglizard, Crabdozer, Slamworm, Hypnotick
Present Clock:
Young Clock:
Showdown Galvan Prime is under attack by Khyber and Dr. Psychobos, while Galvan B takes a hit from the less obvious threat of Malware. Present Ben: Heatblast (selected alien was Water Hazard), Humungousaur (2x), Ball Weevil, Big Chill, NRG, Way Big, Feedback
Young Ben: Four Arms, Feedback (4x)
Zed: Omnivoracious, Tyrannopede, Terroranchula, Hypnotick, Vicetopus
Present Clock: Feedback
Young Clock: Feedback
Clock Again During a fight with Eon, a freak accident happens. What appears to be nothing at first results in you realizing that your surroundings appear more like they did five years ago, including the Omnitrix. Present Ben: Diamondhead, Ditto, Wildvine, Clockwork
Young Ben: XLR8, Diamondhead, Armodrillo, Goop, NRG, Wildmutt, Big Chill (selected alien was Armodrillo), Arctiguana, Clockwork
Present Clock:
Young Clock:
Store 23 While visiting McRonald's, you find that this one in particular is run by an insectoid alien, and that it hops dimensions, only for it to wind up stuck in Dimension 23. Ben 10: Eatle, Feedback, XLR8 (2x), Shocksquatch, Upchuck, Spidermonkey, Mole-Stache, Wildmutt, Heatblast
Ben 23: Freezelizard, Rollaway, Electricyeti
Clock 10:
Clock 23:  
Food Around the Corner You've been enlisted to be the peace negotiator between the Appoplexians and the Lewodans. The catch? You're stuck as Gravattack for it, which has ultimately lead to a bit of an... infestation. Gravattack, Jury Rigg, Rath
Tummy Trouble A distress signal sends you and Rook to the planet Peptos XI, home to Upchuck's species, where you learn that they are being invaded by the Incurseans. Upchuck (3x), Big Chill, Spidermonkey, Water Hazard, Kickin Hawk
While You Were Away Rook's younger brother, simply named Young One, contacts you, saying that the people of their homeworld are acting... strange. Terraspin, Gravattack, Ball Weevil, Astrodactyl
The Frogs of War The Incurseans attack Earth, finally having the balls to do so despite it being your turf. Way Big (2x), NRG, Water Hazard, Astrodactyl, Snare-Oh, Rath, Bloxx (selected alien was Big Chill), Nanomech (selected alien was Humungousaur), Big Chill, Four Arms, Humungousaur, Crashhopper, XLR8 (2x), Bullfrag
The Ultimate Heist You wake up in a cell in the prison of the Plumber's base, with no one willing to listen to your pleads to let you out, as you find out you are made to look just like Albedo. Ben: Big Chill, Four Arms (2x), Nanomech, Eye Guy (2x), Water Hazard, Terraspin, Shocksquatch
Albedo: Wildvine, Goop, Big Chill, Humungousaur (2x), Ultimate Humungousaur, Ultimate Echo-Echo, Ultimate Spidermonkey
A Fistful of Brains for a Few Brains More After chasing Albedo, you find yourself kidnapped, trapped in a desolate wasteland where your predators roam. Ben: Cannonbolt (2x, selected aliens were Way Big and Astrodactyl), Ditto, Astrodactyl (selected alien was Way Big), Goop, Upchuck (2x), Eye Guy, Shocksquatch, Crashhopper, Diamondhead, Feedback, Terraspin, Gravattack, Pesky Dust (selected alien was Way Big), Water Hazard, Bloxx, Atomix
Albedo: Brainstorm, Ultimate Albedo (5x), Ultimate Spidermonkey (2x), Ultimate Humungousaur (2x), Arctiguana, Ultimate Arctiguana, Armodrillo, Gravattack, Ultimate Gravattack
Khyber's Pet: Panuncian, Tyrannopede, Crabdozer, Mucilator, Buglizard, Omnivoracious, Vicetopus, Terroranchula, Hypnotick, Slamworm
Khyber's Pet:
The Anur Mash A trip into space causes you to crash land on the mysterious "planet" of Anur Phaetos: the homeworld of Ghostfreak. Wildvine, Crashhopper, Bloxx, Feedback, NRG
Are You My Mummy? Although you've managed to escape Anur Phatoes, Rad's ship doesn't make it far before you wind up on the desert planet of Anur Khufos, home to Snare-Oh's species.
Where, Wolf? Learning more of Zs'Skayr's plans, you try to head for Anur Transyl, but end up on its moon of Luna Lobo instead when it suddenly reappears in the sky, and its Loboans aren't happy.
It's Alive! Your team finally manages to reach Anur Transyl, Frankenstrike's planet, where you must trek to reach Zs'Skayr in time.
The Vampire Strikes Back Zs'Skayr manages to revive the Vladat warlord, Lord Transyl, who in turn holds the entire system hostage through use of his planet Anur Vladias. Astrodactyl, Whampire, Atomix Alien X
And Then There Were None You've lived a normal life, even more so since the most boring summer ever seven years ago. But things get strange when you suddenly meet... yourself. Ben 10: Spidermonkey, Wildmutt, Astrodactyl
Ben 23: Build-A-Guy
Gwen 10: Florauna
Ben 10,000: Saur Arms, Atomic-X
Bad Ben: Ghostfreak, Gravattack
Mad Ben: Rath
Benzarro: Frankenstrike, Snare-Oh
Nega Ben: Gutrot
Albedo: Humungousaur, Ultimate Humungousaur, Ultimate Spidermonkey
Clock 10:
Clock 23:
Taryn 10:
Clock 10,000:
Bad Clock:
Mad Clock:
Nega Clock:
And Then There Was Clock With Vilgax having destroyed all your alternate selves, Paradox proposes a new approach: going and obtaining the Omnitrix from the past to bring the others together before restoring the multiverse. NW Ben: Grey Matter, Cannonbolt, Armodrillo, Clockwork (2x)
Ben 10: Diamondhead
Ben 23: Eye Guy, Big Bug, Build-A-Guy, Vomit Man
Gwen 10: Kineceleran, Petrosapien, Florauna, Arburian Pelarota
Ben 10,000: Atomic-X (2x), Saur Arms
Bad Ben: Buzzshock
Benzarro: Frankenstrike
Albedo: Ultimate Echo-Echo
Young Ben: Heatblast
NW Clock:
Clock 10:
Clock 23:
Taryn 10:
Clock 10,000:
Bad Clock:
Mad Clock:
Nega Clock:
Young Clock: Ghostfreak
Universe v. Firefly The Celestialsapiens put you on trial for having recreated the universe. Ditto, Bloxx, Upchuck, Terraspin, Way Big, Four Arms, Eye Guy, Alien X Alien X
The Rooters of All Evil The Rooters, a darker, splinter-group of the Plumbers, arrive with a mysterious interest in Kevin's whereabouts. Ball Weevil, Upchuck, AmpFibian, Gravattack
Weapon XI The Rooters have seemingly taken control of Kevin, as well as the Plumbers' Kids that you once called allies. As it turns out, their creation was meant to serve a single purpose: Your destruction. Present Ben: Atomix, Feedback, Alien X, Kickin Hawk, Ball Weevil (selected alien was Way Big), Gutrot, Eye Guy
Young Ben: Eye Guy, XLR8
Present Clock:
Young Clock:
It's a Mad, Mad, Mad Clock World Your day off is interrupted by both the presence of Clock 23 as well as Rook calling you in on a mission regarding a new evil threat: Maltruant. Ben 10: Walkatrout (selected alien was XLR8), Goop (selected alien was Gravattack), The Worst, Mole-Stache, Bullfrag, Jury Rigg, Clockwork (2x), Gravattack, Eye Guy, Bloxx, Rath, Nanomech, Grey Matter
Ben 23: Speedyquick, Toolboxx, Nighty Knight, Mr. Monkey, Rollaway, Techno-Bubble (2x), Dino-Mighty, Freezeghost, Handy Man, Lightning Volt, Brainfrog
Mad Ben: Diamondhead, Upchuck, NRG, Way Big
Clock 10:
Clock 23:
Mad Clock:
Stuck on You Khyber has returned, and although he has no pet to wield his Nemetrix, he has instead teamed up with the Slimebiote known as Skurd. Ben: Heatblast, Humungousaur
Skurd: Crabdozer, Bloxx, Armodrillo, Diamondhead
Khyber: Tyrannopede
Let's Do the Time War Again When Eon attacks, a huge amount of timey wimey events take place that make things a bit... confusing. Ben: Eatle, Feedback, Gravattack, Four Arms, Big Chill
Skurd: Wildvine
Ben 10,000: Crashocker, Jury Grade, Way Chuck
Clock 10,000:
The End of an Era, A New Dawn You're rushed by Paradox into the future to help your future self in a fight against Maltruant. As it turns out, he's far closer to achieving his goal than it was once thought. Ben: Whampire (2x), Ghostfreak (2x), XLR8 (2x), Mole-Stache (2x), Chromastone (2x), Feedback (2x), Four Arms, Ripjaws, Heatblast, Wildmutt, Dimandhead, Upgrade, Cannonbolt, Wildvine, Blitzwulf, Upchuck, Ditto, Eye Guy, Way Big, Swampfire, Echo-Echo, Humungousaur, Big Chill, Brainstorm, Spidermonkey, Goop, Alien X, Lodestar, Nanomech, Rath, Water Hazard, AmpFibian, Armodrillo, Terraspin, NRG, Clockwork, Shocksquatch, Eatle, Jury Rigg, Bloxx, Gravattack, Crashhopper, Ball Weevil, Walkatrout, Pesky Dust, The Worst, Kickin Hawk, Toepick, Astrodactyl, Bullfrag, Atomix, Gutrot
Skurd: Diamondhead, Heatblast, Alien X
Ben 10,000: Humungoopsaur, Atomic-X
Clock: Alien X (2x), Ghostfreak, Four Arms, Stinkfly, XLR8, Diamondhead, Ripjaws, Heatblast, Upgrade, Wildmutt, Grey Matter, Cannonbolt, Wildvine, Blitzwulf, Snare-Oh, Frankenstrike, Upchuck, Ditto, Eye Guy, Way Big, Jetray, Swampfire, Humungousaur, Chromastone, Goop, Brainstorm, Big Chill, Spidermonkey, Echo-Echo, Slapback, Shocksquatch, Atomix, Squidstrictor, Lodestar, Nanomech, Simpleten, Decagon Vreedle, Rath, NRG, Water Hazard, Armodrillo, AmpFibian, Terraspin, Tranquillizer, Snark Tanque, Spitter, Arctiguana, Fasttrack, Sandbox, Snakepit, ChamAlien, Antigravitesla, Captain Clockwork, Clockwork, Big Dig Energy, Jury Rigg, Eatle, Gutrot, Bloxx, Shellhead, Gravattack
Clock 10,000:


Kevin is the version from the No Watch Ben universe, and was used as a conduit by Vilgax when he ended up being trapped there.

Episode Plot Ben's Aliens Clock's Aliens
Anti-Tricked After a new alien is unlocked, the Omnitrix begins to malfunction, and seems to be sending a signal to something... or someone. Cannonbolt (14x), Gax (2x, selected aliens were Overflow and Diamondhead), Wildvine (9x), Grey Matter (10x), Four Arms (14x), Stinkfly (10x), Upgrade (7x), XLR8 (11x), Heatblast (16x), Overflow (7x), Diamondhead (10x) Clock: Overflow, Upgrade
Reboot Kevin:
Riding the Storm Out An electromagnetic field interferes with your transformations, and seems to be coming from a mysterious group of aliens known as the Weatherheads. Grey Arms, Amalgam Ben Amalgam Clock
Out to Launch A rocket launch is hijacked by a new villain known as Lord Decibel. XLR8, Grey Matter (selected alien was Four Arms), Diamondhead, Omni-Enhanced Diamondhead
Animorphosis Two animal-themed villains, Clancy and Dr. Animo, team up to steal DNA from the Omnitrix. Ben: Stinkfly, Omni-Enhanced Stinkfly, Overflow, Omni-Enhancd Overflow
Dr. Animo: Rath
Dr. Animo: Antigravitesla
Steam Fight at the OK Corral The modernization of a wild west town is interrupted by the steampunk Steam Smythe. Four Arms, Slapback, Humungousaur
Clock Again and Again After buying some illegal time travel technology, the young Billy Billions sets out to obtain the Omnitrix before you ever did. Ben: XLR8, Four Arms (2x)
Gwen: Four Arms
Billy: Four Arms
Squirrel: Four Arms
Shocked and Rocked During a fight with the Weatherheads, you finally reunite with Vilgax yet again, just as a new, yet seemingly familiar, alien is unlocked. Four Arms (selected alien was Heatblast), Omni-Enhanced Four Arms, Heatblast, Omni-Enhanced Heatblast, Shock Rock (3x), Overflow (selected alien was Stinkfly), Omni-Enhanced Overflow, Diamondhead Shock Rock
Innervasion Despite the warnings of Vilgax, you've ended up becoming Shock Rock. And it isn't long before you realize your worst enemy might have been right. Ben: Shock Rock (6x, first time selected alien was Upgrade), Four Arms (3x), Omni-Enhanced Four Arms, Grey Matter (2x), Heatblast (2x), Diamondhead, Omni-Enhanced Diamondhead, Cannonbolt, XLR8, Wildvine, XLRArmBlastDiamondHeat
Max: Cannonbolt
Gwen: Stinkfly
Clock: Shock Rock 
This One Goes to Eleven Your attempt to stop a robbery at a notable warehouse keeps getting interrupted by the sudden appearances of the alternate Kevin 11. Ben: Diamondhead, Stinkfly, Humungousaur
Kevin: Wreckingbolt
King of the Castle You and the alternate Kevin find yourselves trapped in a labyrinth by the mysterious lone Forever Knight. Ben: Humungousaur, Heatblast, Four Arms
Kevin: Thornblade, Undertow, Dark Matter
The Night Clockwork Firefly Came to Town What is meant to be a relaxing vacation trip to a mining town results in you becoming somewhat disillusioned by your team. Four Arms, Slapback, XLR8, Heatblast
Roundabout Rook and Charmcaster become worried when Clock has gone off the grid, only to find he has reluctantly joined forces with the Forever Knight and alternate Kevin 11 to stop his past self from obtaining the Omnitrix. Ben: Diamondhead (2x), XLR8, Humungousaur, Four Arms, Shock Rock, Rath
Kevin: Rush, Bashmouth, Quad Smack, Wreckingbolt, Thornblade, Dark Matter, Crystalfist
What Rhymes with Omnitrix? After your previous timey wimey visits to that night you gained the Omnitrix, you head back to that spot in the present, only to find a piece of the puzzle you've been missing this whole time. Rath, Humungousaur, Four Arms, Omni-Kix Four Arms
Tales from the Omnitrix When the alternate Kevin 11 returns to the present, he insists on taking a break from the fighting, and you two, along with Rook and Charmcaster, end up thinking of whimsical stories to cut the tension. Ben: Four Arms (3x), Jetray (2x), Shock Rock, Rath (2x), Omni-Kix Rath
Kevin: Dark Matter, Bootleg, Crystalfist, RushSmackShot
Clock 10 vs. The Universe When attempting to save Earth from an incoming asteroid, you instead find yourself whisked away on an intergalactic adventure with all kinds of returning faces. Ben: Jetray, Omni-Kix Jetray, Omni-Naut Jetray, Heatblast, Omni-Naut Heatblast, Humungousaur, Omni-Naut Humungousaur, Shock Rock, Omni-Naut Shock Rock, Cannonbolt, Four Arms, Diamondhead, Way Big