Gilligan's Island

Gilligan's Island was a 1964-1967 sitcom starring Bob Denver, Alan Hale Jr., Tina Louise, Dawn Wells, Jim Backus, Russell Johnson and Natalie Schafer. It was an escapist show about 7 people marooned on an uncharted island somewhere in the middle of nowhere and their attempts to survive and be rescued. It produced 98 episodes and was cancelled last minute resulting in the cast never being rescued. It remained very popular in syndication years after it came to an end. During its first season Gilligan's Island was aired at 8:30 Saturday evenings on CBS opposite Lawrence Welk and the short lived Dennis Weaver / Harry Morgan comedy-drama Kentucky Jones. (Preceding Kentucky Jones those evenings was the Adventures of Mr. Magoo who was voiced by Gilligan's cast member Jim Backus.) It was the 9th highest rated sitcom that season behind Bewitched, Gomer Pyle, Andy Griffith, Dick Van Dyke, The Lucy Show, The Beverly Hillbillies, My Three Sons and Petticoat Junction. 
It's second season, 1965-1966, found it aired on Thursday evenings at 8 opposite The Donna Reed Show and Daniel Boone. It was produced in color that season and was the 11th highest rated sitcom behind Gomer Pyle, The Lucy Show, Andy Griffith, The Beverly Hillbillies, Bewitched, Hogan's Heroes, Green Acres, My Three Suns, Get Smart, and the Dick Van Dyke Show.
It's third and final season found it moved once again, this time to Monday evenings at 7:30 opposite The Iron Horse and The Monkees. It was not rated in the top 12 sitcoms that season. 
Apparently, Gilligan's Island was cancelled "last minute" just before the 4th season was about to go into production, when the president of the network and his wife wanted their favorite show moved to the Gilligan's time slot.  
Gilligan's Island