Clue Club
One of Our Elephants is Missing (1x13)
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The Clue Club go to the zoo to search for a missing elephant, but also some other animals. D.D.'s idea of disguising as a chimpanzee to stake out the thief doesn't work. At the docks, Chris Carloff and his accomplice Dr. Henkan are proved to be the thieves that smuggled the zoo animals.