Marooned (Unaired Pilot)

Marooned is the original pilot of "Gilligans Island," made in 1963, but not broadcast until October 16, 1992 according to the IMDB database!

Synopsis
On an empty deserted beach, the Skipper wakes up to find the uss Minnow beached after a big storm. Gilligan wakes to find him missing and calling for him, so he dives off into the sand. Worried they might be lost, they fear it might take a wile to get home with the damage to the boat. As the radio reveals they are lost to the public, the Professor tries to fix the transmitter while Gilligan and Skipper search the island for signs of human life. The Skipper orders Gilligan to climb to the top of the tallest tree to get a better view of the whole island, knocking coconuts off to hit the Skipper in the head. Gilligan says he sees a boat, but it is just the Minnow and the passengers. Sent fishing, Gilligan intrigues the Howells by catching and wrestling with a shark. He also accidentally latches on to the transmitter and radio just as the Professor gets them working and loses them in the tide. Gilligan is fast proving himself to be a problem the harder he tries to help, blowing out a match too quickly before the Skipper can get a fire started. However, he does get in good graces again by recovering the lost radio and transmitter in the bodies of fish he catches. With them recovered and working again, the Professor successful calls for help, but Gilligan returns with firewood and blindly crushes the transmitter unknowingly at his feet!

Trivia

 * This cast of this episode differed from the cast of the series with John Gabriel playing the Professor and the girls replaced by two secretaries named Ginger and Bunny played by, respectively, Kit Smythe and Nancy McCarthy. All the regular roles, however, remain intact. Bob Denver as Gilligan, Alan Hale Jr. as the Skipper, Jim Backus as Mr. Howell and Natalie Schaefer as Mrs. Howell.
 * Segments of the pilot turn up in the episode, Birds Gotta Fly, Fish Gotta Talk.