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I heard somebody's got beef with Bens.

Ultimate Alien Ben

Benjamin Kirby "Ben" Tennyson is an alternate version of Ben. He is a representation of 16-year-old Ben Tennyson from Ben 10: Ultimate Alien.[note 1]


Ben's appearance is similar to his Alien Force counterpart, save their Omnitrix/Ultimatrix, despite being a year older than him. His outfit consists of a black shirt, blue jeans and a green jacket with white stripes and the number 10 on it, and black and white Converse-style shoes.

Ben wears an Ultimatrix on his left wrist, a Omnitrix-like device that resembles a green gauntlet instead of a watch.


Compared to Alien Force Ben, this Ben is a show off and is slightly more cocky due to his newfound fame, as shown when he showed off his Ultimatrix to his alternate dimension versions of himself. He isn't as arrogant as Omniverse Ben, though, and remains as heroic and selfless as any other Ben at heart. Ben shows a lot more serious persona when it is time for battle than he does 'off the clock'.


Ultimate Alien Ben first appears in Alien X-Tinction, where he is brought to Dimension 27998.3 by Maximilian Tennyson to help fight Alien X. Ordering Maximilian to get Ben to safety, Ultimate Alien Ben transforms into Ampfibian and battles Alien X alongside Alien Force Ben as Chromastone.

After a short battle, Ampfibian retreats from Adrenaland while carrying Max in his tentacles before timing out. Before Alien X could remove his Ultimatrix, Ben and Maximilian arrive with help from Original Series Ben, Omniverse Ben, and Gwen 10.

Turning into Ampfibian again, Ultimate Alien Ben tried to battle Alien X only to instead rescue Gwen 10 as Ripjaws. Ben eventually convinces everyone to fight Alien X at the time. As Ampfibian, Ultimate Alien Ben is able to synchronize his powers with his counterparts, giving Gwen 10's Ripjaws an opportunity to retrieve Ben's Omnitrix. However, Ampfibian is briefly incapacitated by Alien X when he tried to save Gwen, Max, and Maximilian. After Alien X is defeated, Ultimate Alien Ben congratulates Ben on saving the Omniverse before returning to his home dimension.

Powers and Abilities


Ben possesses the Ultimatrix. Through it, he can transform into various aliens and utilize their respective powers.


Whenever the Ultimatrix times out, Ben is left powerless until he switches to a new alien form.


Ben 10

Season 5


  • This Ben's design is a stylized version of 16-year-old Ben Prime's regular appearance in Ultimate Alien except he has white stripes on both sleeves of his jacket whereas Ben Prime's jacket only had stripes his right sleeve.
  • Ultimate Alien Ben's Ultimatrix is worn in a backwards position compared to the way Ben Prime wore his Ultimatrix during Ultimate Alien, although this is most likely an error.
    • Towards the very end of the special, it was positioned right-side-up.
  • The reason why Ultimate Alien Ben used only Ampfibian during Alien X-Tinction was due to time constraints and design costs.[DR 3]


  1. Duncan Rouleau claims that the four alternate Bens featured in this special are the same as the Ben Prime from the previous four series.[DR 2] However, there are subtle differences between the Bens compared to their Classic counterparts, such as Ultimate Alien Ben wearing his Ultimatrix backwards. And while these could just be errors, it is never directly confirmed whether or not Alien Force Ben's device can travel through time. Furthermore, Cartoon Network considers Alien Force Ben and Ultimate Alien Ben to be two distinct Bens from different dimensions.[CN 1] As such it is open to interpretation as to whether or not this Ben is Ben Prime. This wiki, however, considers them separate characters who are based on the Bens from the series they represent.


Duncan Rouleau

Cartoon Network U.K.

Tennyson Family Ben TennysonGwen TennysonMax TennysonGlitchLady Wilhelmina Warwick
Levin Family Kevin LevinKevin's Father
Secondary Characters Phil BillingsVin EthanolSimon SezRyan SezMaxine SezCash MurrayJ.T.SallyToddSteveBillScottie FangFangPennyForgetiMelvinTevinCybearShasta FayMary Jo FourfeathersAzmuth
Accidentals NuggetMinitaurGoatadactylChinzilla
Others RefereeGlamour ManShady Looking DudeProspector PeteLesterStarshineEstherKomalOliverI.J. CrowlingGeezer BobBetts McCabeCadobbitLennyMrs. RolandBlackSmithSir CrepeRobin FoodClerkTetramand OverlordessBasherClaymoreAlien GuyMac BennysonHelen TroyMilleousMajor Glorff
Mascot Guards AllenElvisphantPretzel PeteTyrone
Tv Show Characters Lucky Girl • BizmarkSpleenBobQuinnKyle
Crossover Nexus K.O.GarnetRaven
Future Characters Aloysius AnimoA.I. MaxBen 10,000Gwen TennysonHexHitchMauricePolar TwainZombozoSergeant SmytheSolar TwainSydney
Generator Rex Characters Rex SalazarBobo HahaAgent SixVioleta SalazarRafael Salazar
Alternate Timeline Maximilian TennysonBen Tennyson (Maximilian's Dimension)Alien Force BenUltimate Alien BenOriginal Series BenOmniverse BenGwen 10
Non-Canon Ranger Ryan
Alternate Bens
Primary Dimension
Ben Tennyson
Alternate Future Timeline
Ben 10,000
Other Dimensions
Original Series BenAlien Force BenUltimate Alien BenOmniverse BenBen Tennyson (Maximillian's Dimension)Evil Ben