The youngest member of S.T.A.R.S Brave Team.

Billy Coen. A mysterious drifter.

Experience the events that led up to the infamous mansion

incident.

Untold fear lurks around every corner.

Use your wits and sheer will to survive.

As wheels of fortune begin to turn......

You've been here before, and yet it's the first mission for the elite S.T.A.R.S. Bravo team. The T-virus is making its first mark on the world, and it's all too familiar -- ruined men moaning for bits of flesh, diseased dogs scavenging for hopeless survivors... and what's more... A maze of senseless puzzles and riddles waits to twist your brain and defy your logic. Welcome back to Raccoon City for the first time.

Good thing we're here to clear your head. In the following blood-stained documents are contained the details of your mission; if at any time your objective is unclear, consult these pages. We're here to guide you through this rigorous test of survival horror, with detailed information on the "unique" fauna in the surrounding areas, as well as step-by-step instructions on how to carry-out this daunting assignment.

Hope for survival? Leave it at the door -- in your attempt to uncover the origins of the sordid events taking place in Raccoon City you'll be living minute-to-minute; not looking forward to a cozy bed, but only trudging on to your mission's end.

Indeed, Resident Evil 0 even starts off much like the original game in the series, as the S.T.A.R.S. Bravo team is sent in to investigate reports of nasty creatures devouring the residents of Raccoon City. Their chopper goes down en route, and the team starts wandering the forest they've crashed in. Eventually, one of its members, Rebecca Chambers, stumbles upon a military police jeep and a file that leads her to believe that the soldiers who were driving the jeep were escorting a prisoner to his execution. Instead of wandering into a mansion, Rebecca stumbles upon a train whose passengers have been killed by a gang of super leeches that were being controlled by a mysterious man with long blond hair. Within minutes, Rebecca meets up with the convict Billy Coen, and despite Rebecca's reservations, the two decide to team up and take on the hordes of evil creatures together. As Resident Evil 0's story unfolds, you'll learn more about Billy Coen (including the reason for his slated execution) and the origins of the Umbrella Corporation and its horrible T-virus, which creates man-eating zombies, giant insects, and assortment of other evil things. The story is told using cutscenes (both prerendered and real time) and the various documents that you find lying about, most of which read just like every other document in a Resident Evil game.

Playing as different characters isn't something new to the Resident Evil series, but Resident Evil 0 marks the first time that you can play as two characters throughout the majority of the game. Before starting the game, you'll learn that Billy and Rebecca have different skills and abilities that come into play. Billy is the stronger of the two and as such can absorb much more damage than Rebecca. He can also push heavier objects, like bookshelves and crates. Rebecca's only unique skill is her ability to mix various chemicals. Both can carry any weapons or items that you find scattered about. Ultimately, this disparity more or less results in Rebecca becoming a pack mule of sorts, relegated to carrying extra items for Billy and contributing some support fire in combat. Later in the game, though, you'll have no choice but to use the weaker of the two in some tough situations.

You can switch between Rebecca and Billy on the fly.

When the two characters are close to each other, there are a number of different types of behaviors you can choose from for the character you aren't controlling directly. You can set whether the computer-controlled character will stay where he or she is of follow you and whether he or she will shoot or stand still when confronted by an enemy. You can swap items between the two. Generally, these specifications are set in the inventory screen, but you can also use quick shortcuts to tell the other character to follow you or to switch control to that character. It's also worth noting that the AI-controlled character can still be moved manually at all times using the C stick on the GameCube controller, but you don't have the ability to manually make that character fire a weapon or open doors. For the most part, the team mechanic works quite well. You'll save ammunition and health and generally have an easier time wasting zombies by working in tandem with the computer-controlled character, so keeping them together at all times (except when they're forced to separate) is usually a good idea. However, when fighting enemies in tight spaces, the computer tends to have trouble in determining when to attack, and you'll often find yourself moving in closer to an enemy so you can spur your partner into action.

The team system extends beyond killing the finest in genetically mutated freaks, as it comes into play during the puzzle-solving sequences. Unfortunately, this aspect of the game doesn't quite live up to its potential. Most of the team-oriented puzzles in Resident Evil 0 simply require either Billy or Rebecca to find an item in a portion of an area they've been trapped in and then send it through a dumbwaiter or elevator so that they can eventually regroup. Some simply require one character to act as a statue of sorts, keeping a door open so the other can run in and grab an item. Other situations put the second character in a strategic location so you don't have to run back and forth to flip switches or turn knobs while attempting to solve the puzzle. In the end, the mechanic doesn't really feel very innovative or interesting, and the fact that some of the puzzles are simply slight variations on those seen in previous games in the series doesn't help matters.