Keep Me In Mind (Buffy the Vampire Slayer)

Nemesis Ethan Rayne returns to Sunnydale and unleashes a long-trapped sorcerer from medieval Bavaria. And if working out Ethan's true motivation while dealing with a none-too-friendly spellcaster on the loose were not enough to keep Buffy from her chemistry homework, she also finds hereself encountering a seemingly random parade of old adverseries out to settle the score.