The Aliens under the command of Illyria awaken the Old One that could destroy the world.

The most deadly of Hunters watches a fellow work.

Repercussions from the events in "Synthesis" echo throughout Earth and the Galaxy.

The Senior Partners assemble the Alien and Predator in Sunnydale in order to test the Slayer.

BtVS/Predator crossover. Something is killing predators on their homeworld. Something they can't see, much less fight. Something from Earth. Now, a predator matriarch turns to another kind of predator who can see, and kill, what they can't: Buffy Summers.