Expedition to the Barrier Peaks is a 1980 adventure module for the Dungeons & Dragons roleplaying game and was written by Gary Gygax. While Dungeons & Dragons (D&D) is typically a fantasy game, the adventure includes elements of science fiction and thus belongs to the science fantasy genre. It takes place on a downed spaceship; the ship's crew has died of an unspecified disease, but functioning robots and strange creatures still inhabit the ship. The player characters fight monsters and robots, and gather the futuristic weapons and coloured access cards that are necessary for advancing the story. Expedition to the Barrier Peaks was first played at the Origins II convention in 1976. In 1980, TSR updated the adventure for first edition Advanced Dungeons & Dragons rules and published it. The adventure is an old-time favourite of many Dungeons & Dragons fans. It was ranked the fifth-best Dungeons & Dragons adventure of all time by Dungeon magazine in 2004, and received positive reviews from White Dwarf and The Space Gamer magazines. Expedition to the Barrier Peaks comes with a booklet of 63 numbered illustrations, depicting the various monsters, high tech devices, and situations encountered in the adventure. Typical of TSR AD&D modules, the inside of the cover doubles as a map, and this item also included a second interior cover insert that was a double-sided map for a total of six map sections (portraying the ship levels I through VI).