Buffy the Vampire Slayer/Angel: Hellmouth #1

Buffy Summers, the Slayer, has one job—keep the forces of hell from coming to Earth through, uh, Hellmouth. Here's the bad news—she might have failed. The Mistress Drusilla and her ally, Spike, have found a weapon to open the Hellmouth and unleash unspeakable evil across the town and the world. With time running out, Buffy must team up with a new ally that she doesn’t fully trust—the vampire vigilante known as Angel! Can these two find a way to work together before the Hellmouth opens - or will they decide they might be each other's greatest enemy?