It has the same game engine, but the difficulty and map size are increased, making it much lengthier. TFTD has the look of a 'reskin' or an expansion, but is an actual sequel to UFO Defense. Now, they're upset that humanity had the audacity to deny their space-borne brethren the rite of conquest, so they're picking up where the war left off. Turns out they visited Earth a long time ago, and then never left due to crash-landing. After their last failed bid to invade, the aliens on Cydonia sent a message.to the oceans of Earth.

This sequel includes a few new weapons, but keeps the Geoscape and Battlescape views of the game and the research element.X-COM: Terror from the Deep is the '95 follow-up to X-COM: UFO Defense (or Enemy Unknown, depending on your nationality) which tries to change as little as possible. 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

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