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?

Buffy and Angel must find a way to work together as the Hellmouth begins to open and evil spreads across Sunnydale. But can Angel keep his true identity a secret from Buffy, or will the Hellmouth force him to reveal the monster within?

Angel and Buffy are on a mission to find the Mistress and close the Hellmouth—but will they turn on one another first? And is Drusilla the true evil behind the Hellmouth, or if there is another, even more powerful, that they should be worried about? Spoiler: there is.

Buffy and Angel come face to face with the secret enemy behind the evil that has overwhelmed Sunnydale - but the deadliest secrets may be the ones they're hiding from each other! And nothing will ever be the same!

Buffy and Angel meet for the first time - but are they friends or enemies? Buffy and her Scooby Gang will have to muster all their strength as they deal with an open Hellmouth that threatens the lives of everyone they love in Sunnydale. Meanwhile, Angel, the vampire cursed with a soul, arrives in town to find his redemption by doing whatever it takes to close the Hellmouth...and no human, demon or Slayer will stand in his way.