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Angel, season 1 episode 9 «Hero»: air date November 30, 1999. Episode overview, season trailer and the cast of Angel.
The gang at Angel Inc. works to save a group of demon refugees and soon find themselves in the middle of a war. An evil band of demons, called the Scourge, is in LA. They're determined to wipe out all the "impure" demons and humans that they can find. When the Scourge unleashes a deadly weapon Angel, Cordy and Doyle are faced with an impossible decision and the ramifications from it will change them forever.