The ExtraTERRORestrial Alien Encounter (often abbreviated Alien Encounter) was a "theater-in-the-round" attraction located in the Tomorrowland section of the Magic Kingdom theme park at Walt Disney World Resort. A co-production between Walt Disney Imagineering and Lucasfilm (then separate from The Walt Disney Company), the attraction was a darkly humorous science fiction experience that used binaural sound to achieve many of its effects.