Pink Panther and Pals
Eli the Aardvark (1x56)
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Aardvark tries to drop a boulder on Ant to make a meal of him, but it hits Eli the Elephant, who's carrying a cart of blueberries. As a result, he develops amnesia and is colored blue, enabling Aardvark to manipulate him into believing they're brothers, then uses him in efforts to catch the Ant, which ultimately fail. Eventually, another boulder drops on Eli, restoring his memory, and he thwarts Aardvark again.