Power Rangers
The Chameliac Warrior (7x29)
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Chameliac, a monster with a computerized memory, learns all of the Lost Galaxy Rangers' (and Magna Defender's) battle skills and moves, and uses it against them. He's even got the Megazord attacks copied! Thanks to Mike's bright idea of having the Rangers (and Megazords) switch attacks mid-battle, Chameliac is confused and defeated.