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Benjamin "Ben" Kirby Tennyson, also known as Alien X, is the final antagonist of the 2016 reboot of the Ben 10 franchise, being the main antagonist of Alien X-Tinction. He is an alternate evil counterpart of Ben Tennyson.

He was voiced by Fred Tatasciore.



This Ben was normal as the reboot version of Ben Tennyson. However, Vilgax consistently attempts to steal the Omnitrix from Ben until a particular fight when Gwen and Max tries to assist him against his wishes. Tragically, Vilgax used his optic lasers to destroy the Rustbucket, killing Gwen and Max in the process.

Horrified and enraged by this, Ben used Four Arms to scatter the Omnitrix, causing an explosion that destroyed Vilgax once and for all, therefore avenging the deaths of both Gwen and Max. Ben transforms into Alien X and remains trapped in his powerful newfound alien form. Devastated at the deaths of his cousin and grandfather, he decided to used his new alien to travel throughout the Omniverse to hunt down his alternate counterparts to make them suffer the same way as him by taking away their Omnitrices, as well as occasionally destroying or severely injuring them.

Prior to the events of the episode, Maximilian and 15 year old Ben Prime have been chasing Alien X down.

Alien X-Tinction

Alien X obtained a Omnitrix from an alternate timeline where Gwen never joins Ben on a summer road trip with Max, before travelling to the Reboot timeline. The Reboot Ben transforms into Four Arms, Heatblast, Humungousaur, Diamondhead and Rath, but those aliens was defeated by Alien X, proving to be too powerful for any of his alien to fight, and ends up losing his Omnitrix to Alien X. However, Ben eventually reobtain his Omnitrix with the help of his family and his other alternate counterparts, who also help him to remove the stolen Omnitrices from Alien X's body. Ben and his counterparts team up and successfully defeated Alien X with all their efforts. Omniverse Ben used Bloxx to handcuffed Alien X after being weaken from having the Omnitrices removed. Alien X finally reverts back into Ben and was taken to the Null Void by Maximilin Tennyson (alternate counterpart of Max Tennyson) as punishment for crimes against other Bens.


           Ben10Title.png Villains

Main Villains
Vilgax | Aloysius Animo | Hex | Zs'Skayr | Highbreed | Aggregor | Maltruant

The Faction
Khyber | Malware | Dr. Psychobos | Khyber's Panuncian

Charmcaster | Michael Morningstar | Addwaitya

Forever Knights
Forever King | Driscoll | Enoch | Joseph Chadwick | Sir George | Sir Morton | Winston | Forever Ninja

DNAliens | Mizaru | Simian

Negative 10
Rojo | Clancy | Sublimino

Flame Keepers' Circle
Dagon | Conduit Edwards | Esoterica

Circus Freaks
Zombozo | Acid Breath | Frightwig | Thumbskull | Zombie Clowns

Incursean Empire
Milleous | Attea | Raff

Bounty Hunters
Sixsix | Sevenseven | Eighteight | Synthroid | Sunder

Zs'Skayr Allies
Dr. Viktor | Yenaldooshi | Mummy | Crujo | Lord Transyl

Octagon Vreedle | Rhomboid Vreedle | Isosceles Right Triangle Vreedle

The Hive
Elena Validus | Nanochips | Decoy Queen

Psyphon's Gang
Psyphon | Bug-Lite | Bubble Helmet | Liam | Fistrick | Gorvan | Sweet-Eels Sparklefunk | Tummyhead

Proctor Servantis | Phil Billings | Ragnarok | Swift

Captain Nemesis | Kangaroo Kommando | Will Harangue

Future Timelines
Vilgax | Aloysius Animo | Kevin 11,000 | Devlin Levin | Sploot | Subdora| Exo-Skull

Evil Bens
Albedo | Alien X | Bad Ben | Benzarro | Eon | Mad Ben | Nega Ben

S.A.M. | Slix Vigma | Computron | Stalker

Nemetrix Aliens
Buglizard | Crabdozer | Hypnotick | Mucilator | Omnivoracious | Slamworm | Terroranchula | Tyrannopede | Vicetopus

Antitrix Aliens
Bashmouth | Bootleg | Crystalfist | Dark Matter | Hot Shot | Quad Smack | Rush | Skunkmoth | Thornblade | Undertow | Wreakingbolt

Other Villains
Argit | Mr. Beck | Benevelon | Blarney T. Hokestar | Blue Leader | Camille's Ex-Boyfriend | Chronians | Collectimus | Fistina | Great One | Heatbat | Hoodlum | Hulex | Jarett | Jennifer Nocturne | Kevin Levin | Kolar | Captain Kork | Kundo | Lepidopterran Prisoner | Looma Red Wind | Mr. & Mrs. Mann | Morgg | Mutant Reptile Leader | Mutant Seagull | Nyancy Chan | P'andor | Poltroon | Prisoner 775 | Red Leader | Seebik | Skurd | Solid Plugg | Ssserpent | Sunny | Trumbipulor | Violet Offenders | Vulkanus | Vulpimancers | King Xarion Zed |

Vilgax | High Override | Forever Knight | Kevin Levin | Aloysis Animo | Hex | Charmcaster | Ectonurite Prisoner | Opticoid Prisoner | Loboan Prisoner | High Override | Maurice and Sydney | Mutant Alphas | Bug Gang (Queen Bee) | Tim Buktu | Lord Decibel | LaGrange | Steam Smythe | Weatherheads | Xerge | Xingo | King Koil | Alien Chefs | Yawk | Nanny Nightmare | Boblins | Ground Hawg Gang | Fogg | Jack-A-Lope | Hydromander | Ice Screamer | Goblin | Space Slime

Crossover Villains
Alpha | Black Knight | V.V. Argost | Strike