Angel: War Zone (2000)

Synopsis
When a rich software mogul (David Herman) hires Angel (David Boreanaz) to find out who's blackmailing him with pictures of his visit to a demon brothel, Angel's investigation takes him to the vampire-infested inner city. There, he comes into contact with a group of homeless vampire hunters who refuse to believe that a creature like Angel could be anything but evil. He escapes their clutches only by momentarily kidnapping Alonna (Michelle Kelly), the sister of the hunters' leader, Charles Gunn (J. August Richards). When war erupts between the hunters and a particularly nasty vampire nest, Alonna is turned into a vampire -- and she almost turns her brother, too. Angel, Wesley (Alexis Denisof), and Cordelia (Charisma Carpenter) help defeat the vampires, but Gunn and his gang remain squatting in their digs, vowing to continue their fight. Originally broadcast May 9, 2000, on the WB network, "War Zone" marked season one, episode 20 of the supernatural comedy drama. This episode includes the first appearance of J. August Richards as Gunn, who would become a regular character in season two. ~ Brian J. Dillard, All Movie Guide