Exclusive Video: How I Met Your Mother Stages a Most Frightening Buffy Reunion!

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.

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Green’s Daryl has a surprise in store for his cronies. The catch? It’s located in the depths of hell (i.e his spooky basement). “Can we just see it in the living room,” begs Marshall. “Anywhere less gimp storage-y?”

Press PLAY below to watch the sneak peek, and then hit the comments with your insta-reactions.

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