Angel: Darla Rewatch Season 2, Ep 7
Darla's origin story serves as the flashbackdrop for Angel's attempt to rescue her from Wolfram & Hart, only to find that the rescue she has in mind is to become a vampire again. [more inside]
Buffy the Vampire Slayer: Fool For Love Rewatch Season 5, Ep 7
When a random vamp almost stakes Buffy, she searches for accounts of the deaths of her predecessors, and turns to Spike for information on how he killed two of them. He tells her of his human life as a spineless poet, his siring by Drusilla, and his attraction to the challenge of a Slayer.
Angel: In the Dark Rewatch Season 1, Ep 3
The first* crossover episode has Oz arriving at Angel Investigations, Inc.™®©, to deliver the Gem of Amarra. He's followed close behind by Spike, who indulges in a bit of torture before Doyle and Cordelia and Oz save the day. And of course, Broody McBrooderson decides it's better to stay in the shadows, destroying the Gem to prevent it from tempting him to be evilly invulnerable. [more inside]
Buffy the Vampire Slayer: The Harsh Light of Day Rewatch Season 4, Ep 3
Buffy's relationship with Parker deepens, then implodes. Anya returns to town with Xander on the mind. Spike is back, having been dumped by Drusilla again and picked up a newly vamped Harmony as a rebound. They're searching for the presumed mythical Gem of Amarra, a stone that makes vampires invulnerable.