Donnie LOSES His Mind 🙃 (Literally) | Full Scene | Teenage Mutant Ninja Turtles

Donnie is the smartest Ninja Turtle, there's no doubt about it! But when Donatello's intelligence starts to fade, he quickly goes from the smartest to the... well, you know. Will Leo, Mikey, and Raph figure out where Donnie's brains went off to, and how to get his head back in working order? Find out now in this FULL SCENE from the 2012 series, Teenage Mutant Ninja Turtles.

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