Josh Radnor Ted Mosby Actor Jason Segel Marshall Erikson Actor Alyson Hannigan Lily Aldrin Actor Neil Patrick Harris Barney Stinson Actor, Director Cobie Smulders Robin Sherbatsky Actor Bob Saget Narrator Amanda Peet Jenkins Guest Star Andrew Caldwell Scotty Guest Star Edward Flores Male Jenkins Guest Star Marieve Herington Betty Guest Star Timothy Brennen Novelist Guest Star Lucky Davis *-Year-Old Kid Guest Star Carter Bays Executive Producer Craig Thomas Executive Producer Greg Malins Writer