Yoko Factor

"The Yoko Factor" is the 20th episode of season 4 of the television show Buffy the Vampire Slayer. The episode aired on May 9, 2000 on The WB. Spike, now allied with the hybrid demon/cyborg monster Adam, gleefully separates the Scoobies from each other: Buffy and Riley have some tension when Angel briefly visits Sunnydale; Xander feels unwanted since he is not in college; Willow thinks the others are hostile toward her romantic relationship with Tara; Giles feels unneeded by the others.