John Ritter Jack Tripper Actor Joyce DeWitt Janet Wood Actor Priscilla Barnes Terri Alden Actor Suzanne Somers Chrissy Snow Actor Richard Kline Larry Dallas Actor Audra Lindley Helen Roper Actor Jenilee Harrison Cindy Snow Actor Norman Fell Stanley Roper Actor Don Knotts Ralph Furley Actor Paul Kent Guest Star Jordan Charney Guest Star Sheila Rogers Guest Star Robert Swick Guest Star Sally Kemp Guest Star Gino Conforti Guest Star Christina Hart Guest Star Herman Poppe Guest Star Rod Gist Guest Star Shell Kepler Guest Star Lucille Ball Host Michael Ross Executive Producer, Writer Bernie West Executive Producer, Writer George Burditt Executive Producer, Writer Martin Rips Producer, Writer Joseph Staretski Producer, Writer George Sunga Producer Dave Powers Director Laura Levine Writer Ellen Guylas Writer Shelley Zellman Writer John Boni Writer Michael Baser Writer Calvin Kelly Writer Budd Grossman Writer Bob Brunner Writer