Caveman Austin is a member of the Mountain Cave People's tribe. Because very little happens during the ice age, he invents things to keep himself occupied.
Caveman Austin is primarily purple. He wears a brown animal skin garment that hangs from his right shoulder, brown boots on his feet, and gray stone necklaces around his neck.
Austin has played Caveman Austin in one episode of The Backyardigans: "Cave Party" from season one.