Josh Radnor Ted Mosby Actor Jason Segel Marshall Erikson Actor Alyson Hannigan Lily Aldrin Actor Neil Patrick Harris Barney Stinson Actor Cobie Smulders Robin Sherbatsky Actor Bob Saget Narrator Britney Spears Abby Guest Star Jennifer Lothrop Woman Guest Star Petrea Burchard Female Gallery Patron Guest Star Johnny Palermo Cafe Guy Guest Star Matt Besser Vendor Guest Star Todd Sherry Lawrence Guest Star Steve Hasley Walter Guest Star Justin Alston Coll Black Guy Guest Star Larry Wilmore Dr. Greer Guest Star Carter Bays Executive Producer Craig Thomas Executive Producer Jonathan Groff Writer Chris Harris Writer Pamela Fryman Director