
Through the game, the player is tasked with issuing orders to individual X-COM troops in a series of turn-based tactical missions. The player takes the role of commander of X-COM – an international paramilitary organization secretly defending Earth from an alien invasion. Originally planned by Julian Gollop as a sequel to Mythos Games' 1988 Laser Squad, the game mixes real-time management simulation with turn-based tactics. It was published by MicroProse for DOS and Amiga computers, the Amiga CD32 console, and the PlayStation. This sequel includes a few new weapons, but keeps the Geoscape and Battlescape views of the game and the research element.X-COM: UFO Defense (known as UFO: Enemy Unknown in Europe) is a 1994 science fiction strategy video game developed by Mythos Games.

Like the first one, Terror from the Deep is a strategy, turn-based battle, resource management game. X-COM had been disbanded following the events of the first game, but now they have to get the team back together to handle this new threat. These new aliens wreak havoc on cruise ships and boats and kidnap humans for gruesome experiments. These aquatic aliens were awakened by a beacon that was left active in the main alien base from the first invasion. Only this time, as the name suggests, they are coming from the sea rather than the sky. Set 40 years after the triumph in the first game, the aliens are back and ready for revenge.

However, Terror from the Deep holds its own as a game. This follow-up to the original X-COM is almost identical to the original as MicroProse wanted a sequel to be ready in just 6 months.

X-COM: Terror from the Deep, the sequel to UFO: Enemy Unknown, is a strategy video game developed and published by MicroProse in 1995 for the PC
