threescompany Sitcom whose theme song began, "Come and knock on our door ..." John Ritter sitcom 1977-1984 Suzanne Somers sitcom with a number in its title: 2 wds 1970s-'80s John Ritter sitcom "Odd" TV comedy starring John Ritter (1977-1984): 2 wds '70s-'80s sitcom featuring Don TV sitcom from '77 to '84 John Ritter TV hit '80s sitcom Sitcom that debuted in 1977 Suzanne Somers sitcom