For the first time ever, the hit sitcom visits Comic-Con to kick off its final season with an exclusive look at the show and a panel featuring Josh Radnor (Happythankyoumoreplease), Jason Segel (The Muppets), Cobie Smulders (The Avengers), Neil Patrick Harris (Dr. Horrible's Sing-Along Blog), and Alyson Hannigan (Buffy The Vampire Slayer) and executive producers Carter Bays, Craig Thomas, and Pamela Fryman.