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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 sewe... (more)rs they are easily defeated by Splinter. The Turtles track the one responsible for the mechanical rats to his hide where they encounter Krang.