Teenage Mutant Ninja Turtles (1987)

S4E18 Slash the Evil Turtle from Dimension X

Bebop and Rocksteady decide to use Krang's latest Mutagen on Bebop's pet turtle, Slash, hoping to make him their domestic helper. However, Slash escapes, only to be tricked by a frustrated businessman into setting up the Teenage Mutant Ninja Turtles.