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 Hugh Gillin Guest Star Mina Kolb Guest Star Jennifer Walker Guest Star Michael Ross Executive Producer Bernie West Executive Producer George Burditt Executive Producer Martin Rips Producer Joseph Staretski Producer George Sunga Producer Dave Powers Director Ellen Guylas Writer