Buffy The Vampire Slayer S03 16

Buffy returns from the big city to find her friends have been battling the forces of evil without her. As she struggles to regain her mother's and her friends' trust, a new slayer named Faith arrives in town, quickly winning over all of Buffy's friends. But Faith's arrival is just the beginning of new forces Buffy must face. For a few nights later she encounters Angel, who has somehow returned, feral and violent from the hellish demon dimension where Buffy had sent him. But the real demon Buffy must ultimately face is already on this side of the portal, preparing a special graduation day surprise for Sunnydale High.