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Fourmungousaur is the combination of Four Arms and Humungousaur's DNA. He can only be accessed by using the Biomnitrix.


Fourmungousaur has the body of Humungousaur with the features of Four Arms. His skin is two-toned like Humungousaur's, but the darker tan is replaced by Four Arms' red. He has four Humungousaur arms with Four Arms' gloves on the hands. On his arms and head, he has Four Arms' spikes.

He has Humungousaur's white belt with a green stripe, along with Four Arms' pants that go above the belt. His feet are Four Arms' with Humungousaur's toenails. His head is shaped like Four Arms' with his facial features and Humungousaur's nose.

The Biomnitrix is located on his sash.

Powers and Abilities

Being part-Tetramand, Fourmungousaur can jump just as high as Four Arms.

Being part-Vaxasaurian, Fourmungousaur has enhanced strength at a level similar or greather than Humungousaur's, being able to overpower an Appoplexian and break free from a Thep Khufan's bandages.





Season 5

Naming and Translations

Language Name Origin
French Quadnormosaure from Quad, fourarms and Énormosaure, Humungousaur
Italian 2x2sauro From 2x2,Fourarms and Omosauro,Humungousaur
Portuguese (Br) Quatronormossauro From "Quatro", which means Four, "Enorme", which means Enormous, and "-sauro", dinosaur sufix.
Russian Четырёхрукий Гумангозавр From четырёхрукий, four-armed and гумангозавр , humungousaur
Spanish (HA) Humungosaurio From Humungousaur.


His name is a combination of Four Arms and Humungousaur.


  • Fourmungousaur and Spitter are the only aliens to have never spoken.
Introduced in Ben 10 ArctiguanaBlitzwolferBuzzshockCannonboltDiamondheadDittoEye GuyFour ArmsFrankenstrikeGhostfreakGrey MatterHeatblastRipjawsSnare-ohSpitterStinkflyUpchuckUpgradeWay BigWildmuttWildvineXLR8
Introduced in Alien Force Alien XBig ChillBrainstormChromastoneEcho EchoGoopHumungousaurJetrayLodestarNanomechRathSpidermonkeySwampfire
Introduced in Ultimate Alien AmpFibianArmodrilloChamalienClockworkEatleFasttrackJuryriggNRGShocksquatchTerraspinWater Hazard
Introduced in Omniverse AstrodactylAtomixBall WeevilBloxxBullfragCrashhopperFeedbackGravattackGutrotKickin HawkMole-StachePesky DustThe WorstToepickWalkatroutWhampire
Ultimate Aliens AlbedoArctiguanaBig ChillCannonboltEcho EchoGravattackHumungousaurRathSpidermonkeySwampfireWay BigWildmutt
Fusion Aliens Atomic-XBig ChuckCrashockerDiamond MatterFourmungousaurHeat JawsHumungoopsaurStink ArmsUprigg
Unseen Aliens Decagon VreedleRocksSquidstrictorVentrilosquid
Unseen Fusion Aliens GravadactylXLRG
Future Aliens SandboxShellheadSnakepit
Retconned Eon
Non-Canon AntigraviteslaBob the BlobCartoon Network AlienInvinciblePlantapocalypsePortalerShadowmanStretcheleoThriller Whale

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