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He reluctantly helps the Scooby Gang throughout the season and even begins to fight on their side after joyfully learning that he can harm fellow demons.
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They implant a microchip in his head which prevents him from harming humans. The vampire Spike, having been left by Drusilla, returns to Sunnydale and is abducted by the Initiative, a top-secret military installation based beneath the UC Sunnydale campus, led by Maggie Walsh. Season four sees Buffy and Willow enroll at UC Sunnydale while Xander joins the workforce.
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Various Buffy characters made appearances in Angel, including Buffy herself Cordelia Chase, formerly a regular in Buffy, and Wesley Wyndam-Pryce, who appeared in Buffy season three. Beginning with this season, the character of Angel was given his own series, which aired on The WB following Buffy. It maintained its previous timeslot, airing Tuesdays at 8:00 pm ET. The fourth season of the television series Buffy the Vampire Slayer premiered on October 5, 1999, on The WB and concluded its 22-episode season on May 23, 2000.
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