Gilligan vs. Gilligan

Gilligan vs. Gilligan is the 70th episode of Gilligan's Island and the second episode of the third season.

Synopsis
One of Mary Ann's coconut cream pies disappears, and the Skipper and the Professor accuse Gilligan after he has found the empty pie plate. Trying to prove his innocence, Gilligan discovers there's a foreign spy on the island. he's a Russian agent given Gilligan's face to run reconnaissance on the castaways, but no one believes Gilligan when he tries warning them. The spy eventually takes Gilligan captive, and ends up alienating the others trying to get answers. He accuses Mr. Howell of cheating at chess, upsets Ginger by coming on to her and accuses the skipper of the wreck of the Minnow. The Professor just believes Gilligan is having a nervous breakdown, so we he finally escapes back to the compound, no one believes him when he says he was taken captive. This leaves Gilligan to try and confront the imposter himself in the Howell's hut, but the spy escapes for his boat hidden in the lagoon. He stops briefly to threaten Gilligan with a death ray from his gold pocket knife, but Gilligan tells him his boat is floating off and he swims after it. By evening, the Skipper tries to convince Gilligan the spy was just a figment of his imagination, just as the Professor wanders by with the Spy's lost gold pocket knife.

Trivia

 * According to Gilligan's imposter, his gold pocket knife had over 200 different uses: radio/transmitter, tape recorder, laser beam and even a death ray, even though it ends up ruined from the lagoon.
 * In the tag scene, the Professor reveals the spy's lost gold pocket knife and the Skipper is in shock when he realizes Gilligan was telling the truth of another Gilligan on the Island! This ending is often deleted from syndicated versions of the episode.
 * The Spy finds it easy to imitate Gilligan - just say the first dumb thing that comes to mind. The spy also claims Gilligan is so inept that he wouldn't even be a spy 3rd class
 * The part of the twin spy was played by Bob Denver.