In 1979–1980, Filmation made television cartoons starring Mighty Mouse and fellow Terrytoon characters Heckle and Jeckle in a show called "The New Adventures of Mighty Mouse and Heckle & Jeckle". The show introduced two new characters: a vampire duck named Quacula (not to be confused with Count Duckula), and Oil Can Harry's bumbling, large, but swift-running, henchman Swifty. The show premiered in 1979 and lasted two seasons. In the Filmation series and movie, Mighty Mouse and Oil Can Harry were performed by veteran voice artist Alan Oppenheimer, and Pearl Pureheart was voiced by Diane Pershing. Frank Welker played Heckle, Jeckle and Quacula, and Norm Prescott played Theodore H. Bear.