Corridor 7

Corridor 7 is a first person shooter video game remake of the 1994 video game Corridor 7: Alien Invasion.

Plot
A crew of astronauts land on Mars and discover a mysterious object, which they take with them back to Earth. As they re-enter Earth's atmosphere, their shuttle begins to lose control and they crash shortly thereafter. The mysterious artifact is recovered from the wreckage.

The object is taken to a military installation known as Corridor 7. As scientists study it, the object suddenly begins to glow and then opens a portal. The scientists and military officials watch in awe as the portal forms. Shockingly, an alien creature jumps through the portal and starts killing the scientists, followed by more creatures which join in the slaughter.

It isn't long before the aliens have seized control of Corridor 7. The aliens are in fact Martians, who vanished from Mars and became trapped in another dimension. Now they are free and are preparing to turn Earth into their new home.

Rip Marshall, a young Special Forces soldier, is the only one left alive in the base. With the fate of the world at stake, Marshall arms himself and begins to fight through the aliens, his end goal being the destruction of the object. If he doesn't destroy it in time, the rest of the Martian Army will arrive through the portal, and all hope for Earth will be lost.