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A prowler is terrorizing Bedrock, prompting Wilma and Betty to take judo lessons from Professor Rockimoto. Fred laughs at the girls' efforts to defend themselves, and to prove that they're helpless without him and Barney, he disguises himself as the prowler and invades his own house--only to come face to face with the real crook! This is the only Flintstones episode written by series producer Joe Barbera.