Buffy The Vampire Slayer
The Deathless

Buffy has enough problems in her everyday life when she discovers that the stars are properly aligned for an attempt to resurrect a long-dead evil sorcerer. A little investigating leads Buffy and the gang to the necromancer who killed the sorcerer long ago - an immortal of Russian descent named Yulia Dryanushka.

When Buffy and the crew pay Yulia a visit, she assures them that, with Willow's help, she is powerful enough to kill the sorcerer for a second time, should he be successfully revived. Both Buffy and Willow are uncomfortable with aligning themselves with a necromancer, and are unsure if they can trust their new ally. But they have no choice when, twenty-four hours later, the vampires of Sunnydale start behaving strangely, and evil is awakening rather sooner than they expect...