Wolverine’s going to die in 48 hours unless he can steal the cure to the dormant virus that's just now infected his body.  Professor X's Danger Room is a training facility that can fully re-create environments in which the X-Men can practice their powers but one day, the danger room starts to go crazy, and randomly loading up dangerous simulations. It turns out Magneto has loaded a virus into the Danger Room's computer, and now the X-Men have to stop it. Welcome to X-MEN!!