John Ritter Jack Tripper Actor Joyce DeWitt Janet Wood Actor Suzanne Somers Chrissy Snow Actor Richard Kline Larry Dallas Actor Ann Wedgeworth Lana Shields Actor John Getz Guest Star J. Pat O'Malley Guest Star Keene Curtis Guest Star Dick O'Neill Guest Star Don Knotts Ralph Furley Actor Joel Brooks Guest Star Roger C. Carmel Guest Star Jeanne Bates Guest Star Cameron Young Guest Star Reb Brown Guest Star Paul Ainsley Guest Star William Pierson Guest Star Lynda Beattie Guest Star David Himes Guest Star Isabelle Wolfe Guest Star Don Nicholl Executive Producer, Producer Michael Ross Executive Producer, Producer Bernie West Executive Producer, Producer Bill Richmond Producer, Writer Gene Perret Producer, Writer Howard Albrecht Writer Dave Powers Director Sol Weinstein Writer Kim Weiskopf Writer Mark Tuttle Writer George Atkins Writer John Boni Writer Rowby Goren Writer Michael Baser Writer Ian Praiser Writer