Willow and Oz fans, prepare to squee — with fear! Former Buffy the Vampire Slayer sweethearts Alyson Hannigan and Seth Green reunite in Monday’s hour-long How I Met Your Mother (CBS, 8/7c) when Green guest stars as a (super creepy) college acquaintance of Lily and Marshall. RELATED | How I Met Your Mother Casts a Pretty Little Love For [Spoiler]! Plus: Rachel Bilson […]![]()
