Teenage Mutant Ninja Turtles (1987): Season 1, Episode 3

1 - 3: A Thing About Rats

A scientist named Baxter Stockman has created a robot meant for hunting rats, called Mouser. Shredder mass produces the robot and programs them to hunt the biggest rat in New York - Splinter. Shredder wants Baxter dead because he knows too much. Michaelangelo finds out about Krang.