Alyson Hanigan's portrayal of Willow defined Buffy the Vampire Slayer's heart and soul. Original actress Riff Regan was cast as Willow in the unaired pilot but lacked chemistry with the cast.

Alyson Hannigan still hears the famous "one time at band camp" line from fans who come up to her Yes, Alyson Hannigan still hears that famous American Pie line all the time. The main cast from the ...