The personalities of Shredder and Splinter are switched when a device is accidentally activated during a battle between the Turtles and their enemies. As Shredder plans the Turtles' demise and Splinter plans on how to get back to his body, everyone else is clueless.
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I'm glad they didn't use that brain switcher thing on Rocksteady and me.
Don't worry, you can't switch something that isn't there.