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 Sondra Currie Guest Star Janice Heiden Guest Star Britt Leach 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 David Mirkin Writer