Gilligan's Island : Gilligan vs. Gilligan (1966)
Directed by Jerry Hopper
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Synopsis by Hal Erickson
Logic is not the strong suit in this episode, in which a foreign spy who has been surgically altered to look just like Gilligan (Bob Denver) washes up on the island. As part of his secret mission, the Gilligan lookalike (also played by Bob Denver, albeit with a dubbed voice) begins spreading trouble and dissension amongst the other Castaways. Naturally, the real Gilligan is blamed for all the skullduggery--but unfortunately, he can't convince anyone that there are two of him on the same island (after all, isn't one Gilligan enough?)