The Ancient Art of Ninja Hide and Seek

To prepare the Turtles for any future threats, Splinter teaches them some stealth training. After that is done, he sends them on a test to infiltrate the Grand Nexus Hotel to steal Gus's dog tags. When they appear to take too long, Splinter sneaks into the Grand Nexus Hotel, steals the Octopus Elevator Operator's outfit, and plans to find the Turtles before Gus, Big Mama, or the bellhops do.

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S02E07 - One Man's Junk