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Angel, season 1 episode 3 «In the Dark»: air date October 19, 1999. Episode overview, season trailer and the cast of Angel.
Oz comes to LA with a gift from Buffy. She has sent Angel the Ring of Amara, which makes any vampire wearing it "unkill-able." Unfortunately for Angel, Spike has also arrived in town and he's determined to get the ring for himself. Angel soon finds himself in deep trouble and it's up to Doyle, Oz and Cordy to save him.