Two and a Half Men,
Three's Company had to replace one of its title characters after the fifth season, when star Suzanne Somers got into a contract battle with the network. (Two years earlier, the show had survived the loss of landlords Stanley and Helen Roper, who got a spin-off and were replaced by Don Knotts' Mr. Furley.) To fill Somers' role as Chrissy Snow, the show brought in Jenilee Harrison as Chrissy's even dumber cousin Cindy. And after two years, Priscilla Barnes became the third roommate until John Ritter's Jack Tripper fell in love, got married, and received his own spin-off as a wedding gift.