Four Arms is a Tetramand from Khoros DNA sample from the Codon Stream.


Fourarms is about a 12-foot tall alien with four muscular arms and four eyes.

The Omnitrix symbol is on the upper left shoulder and in Ultimate Alien the Ultimatrix is on his chest.

In the Original Series, The black stubble stripe goes from the bridge of his nose to his neck. A second black stripe goes from his chin to his lower lip, and he has four eyes: a main pair, and a smaller pair below them.

In Ultimate Alien, since Ben lost the feature to cloth his aliens, Four Arms is now armored with a gold belt, gold leggings, and 4 golden shackles on every arm.

Powers and AbiltiesEdit

Four Arms has strength that of equal to Humungosaur, where he can create shockwaves simply by pounding the ground or clapping all four of his hands together.


Sometimes Four Arms' muscle mass can be a downfall, since all the extra mass of his muscles makes him relatively slow, and his size makes using things designed for smaller species difficult.


  • Four Arms is the first alien with four arms, the second is Spidermonkey, and the third is AmpFibian.
  • Four Arms has the most voice actors of any alien.
  • In Ultimate Alien, Four Arms new look is similar to an olympic athlete.
  • Four Arms was the most used alien until Humungousaur replaced him in Alien Force and Ultimate Alien.


Ben 10 Aliens
Classic Original 10
DiamondheadFour ArmsGhostfreakGrey MatterHeatblastRipjawsStinkflyUpgradeWildmuttXLR8
Classic Additionals
ArticguanaBlitzwolferBuzzshockCannonboltDittoEye GuyFrankenstrikeSnare-OhUpchuckWay BigWildvine
Alien Force Original 10
Alien XBig ChillBrainstormChromastoneEcho EchoGoopHumungousaurJetraySpidermonkeySwampfire
Alien Force Additionals
Alien Swarm Aliens
Ultimate Alien Aliens
AmpFibianArmodrilloChamAlienClockworkEatleFasttrackJury RiggNRGTerraspinWater Hazard
Heroes United Aliens
Ultimate Alien Ultimates
BenBig ChillCannonboltEcho EchoHumungousaurSpidermonkeySwampfireWay BigWildmutt
Omniverse Aliens
AstrodactylAtomixBall WeevilBloxxBullfragCrashhopperFeedbackGravattackGutrotKickin HawkMole-StachePesky DustThe WorstToepickWalkatroutWhampire
Classic Fusion Aliens
Diamond MatterHeat JawsStink Arms
Omniverse Ultimates
Albedo/Grey MatterArticguanaGravattackRath
Classic Future Aliens
Biomnitrix Fusions
Atomic-XBig ChuckCrashockerFourmungousaurHumungoopsaurUpRigg
Classic Unseen Aliens
Decagon VreedleRocksSquidstrictorThriller WhaleVentrilosquid
Reboot Aliens
GaxOverflowShock Rock
Enhanced Aliens
CannonboltDiamondheadFour ArmsGrey MatterHeatblastOverflowStinkflyWildvineXLR8
Reboot Fusions
Amalgam BenGrey Arms
Non Canon Aliens
AntigraviteslaBob the BlobPlantapocalypsePortaler