Teenage Mutant Ninja Turtles - Season 1 Episode 3 -

Baxter Stockman, a mad scientist, is showing an exterminator his new invention a rat catching robot called Mousers.The exterminator rejects Stockman's offer, however Shredder decides to buy his inventions. He unleashes a dozen mousers into the sewers they are easily defeated by Splinter. The Turtles track the one responsible for the mechanical rats to his hide where they encounter Krang.