The Complete Sixth Season on DVD. Disc 4, Episodes 12-15
Buffy is resurrected from the dead by Willow who thought Buffy was in a hell dimension. What the Scoobies don't know is that Buffy believed was that she actually was in heaven. After being ripped from a peaceful existence, she now considers herself to be in a hell on earth. The depressed slayer secretly turns to someone who knows about death, the Buffy-obsessed Spike, and the two begin a twisted relationship.