X-COM: Terror from the Deep
X-COM: Terror from the Deep was the second game in the XCOM franchise, following the original "UFO: Enemy Unknown". It was released by MicroProse in 1995 for the PC (Windows and DOS), 3DO and PlayStation. This game was set 2040, approximately 40 years after the successful fight against the first alien invasion and featured an alien invasion from the ocean.
In the course of that game, it was revealed that the aliens had in fact come to earth in a huge spaceship which had crashed into the Gulf of Mexico and cause the extinction of the dinosaurs. The player once again led the X-COM unit in the war against the aliens and ultimately defeated them, but in so doing, unleashed an environmental catastrophe which set the stage for the next game, "X-COM: Apocalypse".