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A regular on 1960s TV sitcoms as eggheaded foils to Lucille Ball and many others, playing official types. On the short-lived sitcom "He & She" (1967), Oppenheimer played an accountant by the unlikely name of Murray Mouse. This was most likely an inside joke in light of his most famous role--as the voice of Mighty Mouse. He also did a guest appearance on "Happy Days" (1974) as Mickey Malph, which sounds like Mickey Mouse.