X Marks the Spot

X Marks The Spot is the 18th episode of the First Season. It aired January 30, 1965.

Synopsis
A test missile lands at the Island... Gilligan is the only one who can fit inside to disarm it! Are the castways safe or doomed?

Credits
Main Cast
 * Bob Denver as Gilligan
 * Alan Hale Jr. as The Skipper
 * Jim Backus as Mr. Howell
 * Natalie Schafer as Mrs. Howell
 * Tina Louise as Ginger
 * Dawn Wells as Mary Ann
 * Russell Johnson as The Professor

Guest Cast
 * Harry Lauter as Major Adams
 * Russell Thorson as General Bryan
 * Charles Maxwell as the Radio Announcer (voice only)

Quotes

 * Mr. Howell - "It would be." (After the radio announcer reports that the missile take-off is a perfect launch.)

Trivia

 * The approximate location of the Island is latitude 140 by longitude 10 degrees, which is impossible because latitudes only range ±90.
 * In this episode, when the Castaways try to signal a search plane with a mirror, Gilligan breaks it when he swings off a roof via a vine. {In a later epsiode, when the Castaways try to use a mirror to intimidate a giant spider, Gilligan again breaks the mirror!}