The Harsh Light of Day (the first BTVS Cross over)

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JAMES MARSTERS RETURNS AS SPIKE - The underworld version of Sid Vicious, Spike (new series regular James Marsters), returns to Sunnydale in search of the vampire version of the Holy Grail, a mythical relic that supposedly engenders the wearer with unimaginable powers, and it's up to Buffy (Sarah Michelle Gellar) to stop him. Meanwhile, Buffy is distracted by dating issues as she deals with her feelings for a new boy (guest star Adam Kaufman) who happens to not be a blood-sucking vampire, but is equally as difficult to understand. Xander (Nicholas Brendon) has romance issues of his own when his prom date from last spring, Anya (guest star Emma Caulfield), can't get the X-man out of her mind. Alyson Hannigan, Seth Green and Anthony Stewart Head also star. James A. Contner directed the episode written by Jane Espenson.