To celebrate, stars Josh Radnor, Alyson Hannigan and Neil Patrick Harris, as well as series co-creator Craig Thomas, spoke with PEOPLE about the "special" episode that started it all "You never know ...

Alyson Lee Hannigan (born March 24, 1974) is an American actress and television presenter. She is best known for her roles as Willow Rosenberg in the television series Buffy the Vampire Slayer ...

'How I Met Your Mother' star Alyson Hannigan nabs female lead in Ben Affleck, Matt Damon-produced CBS pilot Alyson Hannigan has landed her first post-"How I Met Your Mother" role as the lead female on ...