Super Friends

Uncle Mxyzptlk (8x12)

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The Wonder Twins accidentally expose Superman to Red Kryptonite which turns him into a 6-year old kid. Throughout the episode the Wonder Twins, Firestorm, and Samurai have to babysit the kid whom they have nick-named super brat. Mr. Mxyzptlk does not make things any better with his practical jokes and pranks.