Synopsis
In 2147, two years after the events of Doom 3, the UAC detects a strange signal from one of its Martian satellites, and consequently sends a team in to investigate. After this team finds an Artifact and the forces of Hell are alerted and begin a new invasion. The player, a marine combat engineer who discovers the hellish device, must fight his way through the base to reach the doctor, chased by demons. McNeil, an unseen character in Doom 3, was the whistleblower who notified counselor Elliot Swann and Jack Campbell of Malcolm Betruger's mysterious activities at the beginning of Doom 3.
The marine eventually finds her, and she tasks him with stopping the invasion by returning the Artifact to hell. In his journeys he defeats the three Hell Hunters (demons who were supposed to find the Artifact) and absorbs their powers into the ancient device.
The marine arrives in Hell and battles his way to Betruger, who has become the dragon-like Maledict. After some fighting, Betruger bites the marine, but before he can eat him, the marine shoves the Hellstone down Betruger's throat, causing him to dematerialize. Only his skull remains. The game ends with a bright white light, followed by McNeil's voice saying, "Marine?... Welcome home."
Read more about this topic: Doom 3: Resurrection Of Evil