In Teenage Mutant Ninja Turtles: Amazing Adventures, Jason, later renamed Mondo Gecko, is a former human who is now a mutant leopard gecko. He is a friend and friendly rival of Michelangelo.
This version of Jason is branched off from his original version in the 2012 TV series. His history before the events of Amazing Adventures is the same as that of his animated version.
- Jason's 2012 TV series counterpart says that he has no eyelids and must lick his eyes to clean them. But this Jason has fully-functioning eyelids with a full range of expression.