John Ritter Jack Tripper Actor Joyce DeWitt Janet Wood Actor Suzanne Somers Chrissy Snow Actor Ann Wedgeworth Lana Shields Actor Richard Kline Larry Dallas Actor Don Knotts Ralph Furley Actor Paul Avery Guest Star John Miranda Guest Star Taaffe O'Connell Guest Star Melanie Vincz Guest Star Ken Letner Guest Star Don Nicholl Executive Producer Michael Ross Executive Producer Bernie West Executive Producer Bill Richmond Producer Gene Perret Producer Dave Powers Director Rowby Goren Writer