Three's Company is an American sitcom television series that aired eight seasons on ABC, from March 15, 1977, to September 18, 1984. It is based on the British sitcom Man About the House.
The story revolves around three single roommates: Janet Wood (Joyce DeWitt), Chrissy Snow (Suzanne Somers), and Jack Tripper (John Ritter), who all platonically live together in a Santa Monica, California, apartment building owned by Stanley and Helen Roper. Following Somers' departure, Jenilee Harrison joined the cast as Cindy Snow, who was soon replaced by Priscilla Barnes as Terri Alden. After the Ropers left the series for their own sitcom, Don Knotts joined the cast as the roommates' new landlord Ralph Furley.