On September 7, 1974, one of the greatest sci-fi television series of all time premiered — on a Saturday morning. Land of the Lost was the brainchild of brothers Sid Krofft and Marty Krofft, the 1970s television super-producers behind children's shows H.R. Pufnstuf and Sigmund and the Sea Monsters, as well as the Donny & Marie variety show. The show featured the Marshall family, who found themselves transported to a prehistoric-like land populated with dinosaurs, monkey-like cavemen, and a terrifying species of lizardmen called the Sleestak.