'How I Met Your Mother' Plots 'Buffy' Reunion With Seth Green

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Buffy the Vampire Slayer fans, prepare to geek out. A key couple from the long dead WB drama is reuniting in primetime.

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How I Met Your Mother announced Friday afternoon, via its official Twitter account, that actor Seth Green is set to guest alongside Mother star and former Buffy cast mate Alyson Hannigan.

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Green's role, naturally, puts him in the company of Hannigan's Lily. He'll play Daryl LaCoutre, a college classmate who looked at Lily and Marshall (Jason Segel) as his best friends -- though they barely remember who he is. They find him 12 years later, still living by the Wesleyan campus, obsessing over a reunion with the married duo.

Hannigan and Green previously played on-screen couple Willow and Oz for roughly three seasons of Buffy the Vampire Slayer -- until Green's character departed the show and Alyson's became a lesbian.

This is not the first time How I Met Your Mother has reunited former Buffy co-stars. Alexis Denisof, who played Wesley Wyndam-Pryce on Buffy and spin-off Angel and is Hannigan's real-life husband, has appeared as daft anchorman Sandy Rivers in eight episodes of the series.

Green's Robot Chicken was recently renewed for a seventh season by Adult Swim. He is repped by UTA and Koopman Management. His episode of How I Met Your Mother is tentatively scheduled to air Dec. 10.