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 Gino Conforti Guest Star Mina Kolb Guest Star Maria Richwine Guest Star Stanley Kamel Guest Star Emory Bass Guest Star William Cort Guest Star Jordan Charney Guest Star Brad Blaisdell Guest Star Julie Piekarski Guest Star Ted Chapman Guest Star John C. Becher Guest Star Karla Bush Guest Star Tom Lancaster Guest Star DeeDee Rescher Guest Star Paul Barselou Guest Star Michael Ross Executive Producer Bernie West Executive Producer George Burditt Executive Producer, Writer Martin Rips Producer, Writer Joseph Staretski Producer, Writer George Sunga Producer Dave Powers Director Shelley Zellman Writer Ellen Guylas Writer David Mirkin Writer Lewis Colick Writer Michael Weinberger Writer Paul Wayne Writer Budd Grossman Writer