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When Merl the Parasite Demon (Matthew James) -- Angel's frequent, if unwilling, informant on the supernatural underworld -- turns up dead, it's just one of a string of puzzling demon murders. Wesley (Alexis Denisof), Angel (David Boreanaz) and the gang follow the killer's trail, hoping to learn why somebody is murdering harmless demons along with evil ones. Gunn (J. August Richards) figures it out first, though; it's the work of his old gang of street fighters, who view all demons as inhuman beasts fit only to be hunted for sport. As the confused and conflicted Gunn arrives at Caritas, his old crew shows up and starts shooting the assembled demons. Because they're human, they aren't bound by the enchantments that prevent demon violence in The Host's nightclub. The poor demons, however, are helpless to fight back. That puts a real damper on Cordy and Fred's evening; Cordelia (Charisma Carpenter) has only just convinced Fred (Amy Acker) to overcome her agoraphobia and visit Caritas, but girls' night out turns into a hostage situation. As the standoff continues, Gunn tries to justify his allegiance to Angel to his old friends. He admits, however, that he's wary of growing too close to his vampire boss. With the help of Angel's friends the Furies, Cordy breaks the spell that's keeping Angel from kicking serious butt. Gunn's gang is vanquished, but the former street fighter's relationships with Angel and Wesley have been seriously compromised. Originally broadcast October 8, 2001, on the WB network, "That Old Gang of Mine" marked season three, episode three of the supernatural comedy drama.