The sinister and powerful Adam (George Hertzberg) decides to advance his plans for humanity's demise by enlisting Spike to turn the gang against one another without their suspecting it. Spike's reward: removal of the anti-violence chip in his head, which has prevented the vampire from attacking humans. Angel: David Boreanaz. Tara: Amber Benson. Riley: Marc Blucas. Xander: Nicholas Brendon.