Chaos Bleeds (game)

Buffy the Vampire Slayer: Chaos Bleeds is the fourth video game based on the Buffy franchise and the first multiplatform one. This is also the first game to allow players to control characters other than Buffy.

From the instruction manual: "When Buffy Summers discovers that an enemy from the past, Ethan Rayne, is at the center of a great struggle with The First, literally the first incarnation of evil the world has ever known, she and the gang must face an undead army of vampires, zombies, and demons to keep these nefarious villains from casting the world into permanent darkness."

The plot also involves different alternate realities bleeding into Buffy's own reality, leading to the reappearance of deceased enemies like Kakistos and the appearance of evil versions of allies, including a vampire Tara.