Humungousaur is the Codon Stream's DNA sample of a Vaxasaurian from the planet Terradino.
Humungousaur is about twelve feet tall when he is not grown and can grow bigger at will, up to 60 feet. When he grows, his dinosaur features become more pronounced, growing Stegosaur-like plates on his back, a crest on his forehead and spikes on his tail. Also on his elbows three plates separate and grow, giving him a more ferocious look. His skin is a brown and beige color.
Humungousaur possesses super strength and a thick layer of skin which provides vast resistance to injury. Humungousaur also has the power to increase his own body size and mass. He can grow up to 60 ft. His strength increases as he grows and he can generate his dinosaur features without changing size.
- Humungousaur is the first Ben's alien transformation in Ultimate Alien.
- In Omniverse, as a running gag through Season 1, Ben has tried and failed to transform into Humungousaur on numerous occasions before finally transforming into him in Of Predators and Prey: Part 2.