Oz's return to Sunnydale leads to his incarceration by the Initiative and complicates the relationship between Willow and Tara.

After joining forces with Adam, Spike drives a wedge between Buffy and her friends. Meanwhile, Angel's return to Sunnydale leads to a violent confrontation with Riley.

Having gained control of Riley's mind, Adam sets in motion his plot to create an army of unstoppable soldiers and destroy the Initiative.