UFO: Extraterrestrials is a Microsoft Windows game aimed to be a spiritual sequel to the highly acclaimed UFO: Enemy Unknown (retitled X-COM: UFO Defense in North America). Developed by Chaos Concept, the game incorporates a twist of the aliens defeating the humans on Earth. The game takes place on a human-colonized planet named Esperanza, where the alien threat has just arrived.

UFO: Extraterrestrials is a Microsoft Windows game aimed to be a spiritual sequel to the highly acclaimed UFO: Enemy Unknown (retitled X-COM: UFO Defense in North America). Developed by Chaos Concept, the game incorporates a twist of the aliens defeating the humans on Earth. The game takes place on a human-colonized planet named Esperanza, where the alien threat has just arrived.