X Marks the Spot Episode Number Season 1 Episode 18 Original Air Date 1/30/65 Previous Episode Little Island, Big Gun Next Episode Gilligan Meets Jungle Boy X Marks the Spot is the 18th episode of the first season. It first aired on January 30, 1965 Contents[show] Synopsis Major Events Debuts Characters Actors/Voice Actors Trivia Quotes Categories: Episodes Season 1 Season 1 Episodes Community content is available under CC-BY-SA unless otherwise noted.