Bethesda Doom 3 - BFG Edition

The ruins of an ancient Martian civilization have unlocked the secrets of teleportation, and the UAC will stop at nothing to harness this world-changing technology. As part of a marine unit dispatched to protect the facility, your mission seemed straightforward enough until the invasion began. Now, in an epic battle against pure evil, you must fight to understand who is with you, who is against you, and what must be done to prevent this nightmare from reaching Earth.