Alyson Hannigan 1989, her first regular role on a TV series came when she was cast in the short-lived ABC sitcom "Free Spirit". As a teenager, Hannigan babysat for the children of her future "How I Met Your Mother" costar, Bob Saget. In 1997, Hannigan was cast to play Willow Rosenberg, Buffy Summers' best friend, on the television series "Buffy the Vampire Slayer". The show became a success, and Hannigan gained recognition, subsequently appearing in several films aimed at teenaged audiences, including "American Pie" (1999), "Boys and Girls" (2000), "American Pie 2" (2001), and "American Wedding" (2003). She also had a guest
Caleb (Buffy the Vampire Slayer) a dream in the e-comic "Always Darkest". Caleb (Buffy the Vampire Slayer) Caleb is a fictional character played by Nathan Fillion in the television series "Buffy the Vampire Slayer" created by Joss Whedon. The character is a sadistic sociopath with a pathological hatred of women. According to Whedon, the character was introduced because the mutable, non-corporeal nature of the First Evil "meant that we didn't really have anything to push against. We needed... a sidekick. Somebody physical that we can see from episode to episode." Whedon describes him as "the creepiest priest", adding, "he is the most bald-faced misogynist we've