It’s a Buffy the Vampire Slayer reunion of sorts: Alexis Denisof, who played watcher Wesley first on Buffy and then on Angel, will guest star on the comedy hit How I Met Your Mother. Denisof has been married to Alyson Hannigan, who played Willow on Buffy and now stars on How I Met, since 2003.

Both the actors and the fans are looking forward to this delightful pairing.

“He actually just did an episode of our show. It was so much fun,” Hannigan told reporters last week during interviews for her film “Date Movie,” which opens Friday, Feb. 17. She won’t reveal who Denisof is playing on the show, but does allow that “it’s very funny and actually, he’s coming back for the next episode as well.”

“How I Met Your Mother,” which airs Monday nights on CBS, is also Hannigan’s first regular role in a TV comedy, although most of her movie work has been comedic. She says she’s enjoying the camaraderie she shares with the cast, which also includes Josh Radnor, Cobie Smulders, Jason Segel and Neil Patrick Harris.

“I was actively looking for a half-hour [show] because of the family aspect of television, going to work with the same people for the majority of the year and getting to do what I love to do,” she says.

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