When simultaneous threats from the Purple Dragons and Baxter Stockman’s mechanical Mousers force the Turtles to split into two groups, Donnie & Mikey must prove that their “B Team” is just as valuable as Leo & Raph’s “A Team.

Casey Jones thinks he can take on the criminal underworld on his own, but soon discovers that he is in over his head.

A new and unfamiliar mutant known as Muckman begins to gain notoriety as New York City's "Monster Hero."

Michelangelo and Casey become friends with Mondo Gecko, a radical, skateboarding, reptilian teenager.