|This article belongs to the Classic Timeline|
The Mutant Kangaroo is a common Earth kangaroo, which was mutated by Dr. Animo.
He looks like a teal kangaroo with blue stripes and spots. He has spikes on his back, claws on his feet, broken horns and his Mandibular canines are a lot longer. One of his claws on both of his feet are Velociraptor-like. It has four, skinny arms. Instead of a pouch he has a big mouth on his belly. His ears are long and they end in white. Its eyes are red.
- It Was Them (first appearance; flashback; cameo)
- The Mutant Kangaroo appears in a support card in Ben 10: Slammers game.
- His pouch mouth looks like Wildmutt's and Mot Snikrep's mouth in the original series.