John Ritter Jack Tripper Actor Joyce DeWitt Janet Wood Actor Priscilla Barnes Terri Alden Actor Richard Kline Larry Dallas Actor Don Knotts Ralph Furley Actor Dick Shawn Guest Star Marsha Haynes Guest Star Fran Ryan Guest Star Steffen Zacharias Guest Star Jordan Charney Guest Star Tom Lancaster Guest Star Michael Ross Executive Producer Bernie West Executive Producer George Burditt Executive Producer Martin Rips Producer, Writer Joseph Staretski Producer, Writer George Sunga Producer Dave Powers Director