Alyson Hannigan

HOW I MET YOUR MOTHER (CBS) - Alyson Hannigan ("Buffy the Vampire Slayer") has joined the cast of the comedy pilot, about the exploits of a single man (Josh Radnor), as told through his own eyes 20 years later. No details were available about Hannigan’s character. In addition, Rob Greenberg ("Frasier") has signed on as an executive producer of the 20th Century Fox Television-based project, which was created by Carter Bays and Craig Thomas ("American Dad")