Editing X-COM: Terror from the Deep (section)

==Plot==
''Terror from the Deep'' is set in 2040, four decades after the events of ''UFO: Enemy Unknown''. Following the destruction of the alien Brain on Cydonia, a transmitter remained active there which awakened a group of aliens under the Earth's seas who had lain dormant for millions of years. After awakening, the aliens proceed to terrorize seagoing vessels and port cities, kidnapping humans to perform bizarre genetic experiments on them. X-COM, which had been disbanded after the first alien war, is revived by the Earth's governments to fight this new menace as the aliens' ultimate goal is to reawaken their supreme leader, a being that cannot be stopped once revived.

Eventually, it is revealed the aquatic aliens, cousins of the Sectoids from ''UFO Defense'', came to Earth on a massive spacecraft, known as T'Leth, that crashed into what is now the [[Gulf of Mexico]] 65 million years ago, causing the [[Cretaceous–Paleogene extinction event|extinction of the dinosaurs]]. Destruction of T'Leth by the player results in victory but also accidentally results in another worldwide environmental cataclysm, destroying the [[ecosystem]] of Earth and setting the stage for the third game in the series, ''[[X-COM: Apocalypse]]''.