Resurrection of Evil takes place two years after the events in
Doom 3. You once again step into the armor of a marine (though this is a different one than in
Doom 3) assigned to the newly opened UAC base on Mars. Apparently, the events of two years ago haven't phased management and, like any good money-grubbing corporation, they've decided to give things another go. Your adventure begins when you discover an ancient artifact that awakens a new portal to hell, which unleashes a whole new group of demons. You eventually hook up with Dr. Elizabeth McNeil, and with her help, you set out to close the portal and stop the invasion.
Story is less important in Resurrection of Evil than it was in Doom 3. There's still an overall narrative that moves you through the game, but at the same time, it's much less invasive, allowing you to spend more time shooting things than shuffling through emails and messages. Because of the game's emphasis on action over story, Resurrection of Evil feels more like the original Doom than Doom 3. Basically, you spend most of the game running through dank corridors, shooting everything in sight and looking for keys to open up the next set of corridors. The action may not appeal to gamers who want more of a story-driven game like Half-Life 2's experience, but those who just want to shoot a lot of things will feel right at home.
The single-player mode isn't very long, and will take about 6-8 hours depending on how good you are. However, it'll be an action-packed few hours that, like Doom, you’ll want to play through a few times.
In addition to enhancing the single-player experience, Resurrection of Evil also adds in some new multiplayer modes. The biggest addition is Capture the Flag, which gives you straightforward CTF matches without adding the fancy enhancements of other versions of the same play mode. New multiplayer maps have also been included, all of which are based on locales found in the single-player mode.