The Girl in Question

Angel gets a phone call from a man he had sent to keep watch on Buffy and is told that she is in trouble in Italy. While there, Angel and Spike must also bring the head of a demon back to L.A. to prevent a demon war.

Angel and Spike come to learn that Buffy is dating The Immortal. They decide that she must be under his spell. Flashbacks to the last century indicate past problems Angelus and Spike had with The Immortal, who had sex with Darla and Drusilla together. This episode ends with the two finally accepting that Buffy is most likely quite happy with The Immortal and going back to LA with the demon head.