Introduced in the series' third season, the young, enthusiastic engineer is made the head of the Foot Clan's Science Division following the numerous failures and subsequent demotion of his predecessor and idol Baxter Stockman, much to Stockman's chagrin. Much of Chaplin's work is based on that of Stockman. Upon The Shredder's defeat at the hands of the Turtles, Chaplin is last seen talking with Karai, who admits she wishes to only think about the immediate future and walks from the battlefield holding Chaplin's hand, returning, for the first time, his affections for her.