Little Island, Big Gun

Little Island, Big Gun is the seventeenth episode of the First Season. It aired January 23, 1965.

Plot
Bank robber Jackson Farrell hides out on the island. In order to trick the authorities, he sends his boys away with the boat so it can be searched. When a rival gang shows up on the island, he takes Mary Ann hostage and has the other castaways dress up like "natives" to convince the gang that he is not on the Island. Later, when he makes his getaway, he has Gilligan throw him the anchor, which is tied to the bank loot which is then chopped up by the boat's propeller. Farrell and his gang are later arrested by the Coast Guard, but the Castaways are still stranded.

Trivia

 * Comedian Larry Storch is best known for the part of the dim-witted Corporal Agarn on the comedy-farce "F Troop" as the side kick to Sgt O'Roarke {Forrest Tucker}. Ironically, Bob Denver played the dim witted sidekick to the Wagon master played by Forrest Tucker in "Dusty's Trail," a kind of Gilligan's Island set in the Wild West
 * When Farrell tries to shoot Gilligan, his gun shoots only water. Later, in the episode, The Hunter, when Kincaid tries to shoot Gilligan after falling into the water trough, his "rifle" also shoots water!
 * The gag of a criminal hiding out on the island and leaves the Castaways stranded was later re-done with Don Rickles as the guest villain.