Alyson Hannigan, who played Willow on Buffy The Vampire Slayer, is, of course, a regular on How I Met Your Mother. Seth Green, who played Oz on Buffy The Vampire Slayer, is currently one of the people behind Robot Chicken but he’s taken time out to appear in How I Met Your Mother – and here’s a picture of him with Hannigan. Sweet, huh? He’s doing a very Oz look, too.
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