General Information
Species 1/2 Tetramand 1/2 Vaxasaurian
Home World None
Body Four Armed Dinosaur
Powers and Abilities
Abilities Super Strength
Enhanced Jumping
First Appearance And Then There Were None
Fourmungousaur is the Biomnitrix's fusion of Four Arms and Humungousaur.


Fourmungousaur has the body of Humungousaur with the features of Four Arms. His skin is two shades of red rather than tan. He has four Humungousaur arms with Four Arms' gloves on the hands. On his arms and head are Four Arms' spikes. Rather than Humungousaur's white belt, he has Four Arms' green belt with a white stripe and Four Arms' pants. His feet are Four Arms' with Humungousaur's toe nails. 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

  • Fourmungousaur has the combined strength of Four Arms and Humungousaur.
  • He can jump really high.


Ben 10: Omniverse

  • And Then There Were None (first appearance)
  • And Then There Was Ben 


  • Fourmungousaur being withheld (in vain) by Emo Ben as Snare-Oh
  • Fourmungousaur in the prototype stage of his development as a character.Go to