After the Turtles settle into their new lair, they discover the source of their Mouser problem: Stocktronics founder and CEO, Dr. Baxter Stockman. Donatello repairs a disabled Mouser and the Turtles track it through the sewers, where coincidentally they stumble upon April O'Neil, a young apprentice fleeing the wrath of Dr. Stockman.
Original air date: February 15, 2003
