The Yoko Factor (1) Buffy the Vampire Slayer : Season 4 Episode 20
TV-14 UPN 44m
Aired: May 9th, 2000 @ 8:00 PM EST on UPN
After joining forces with Adam, Spike drives a wedge between Buffy and her friends. Meanwhile, Angel's return to Sunnydale leads to a violent confrontation with Riley.
