Josh Radnor Ted Mosby Actor Jason Segel Marshall Erikson Actor Cobie Smulders Robin Sherbatsky Actor Neil Patrick Harris Barney Stinson Actor Alyson Hannigan Lily Aldrin Actor Cristin Milioti Tracy McConnell Actor Bob Saget Narrator Sherri Shepherd Daphne Guest Star Anna Camp Cassie Guest Star Edward Herrmann Reverend Robert Lowell Guest Star Michael Rider Knight Templar Guest Star Joe O'Connor Cassie's Dad Guest Star Joshua Hoover Lucky Guy Wesley Guest Star Rob Gleeson Waiter Guest Star Skyler Vallo Grace Guest Star Carter Bays Executive Producer Craig Thomas Executive Producer Pamela Fryman Executive Producer, Director Stephen Lloyd Executive Producer Chris Harris Executive Producer, Writer Chuck Tatham Executive Producer Jamie Rhonheimer Executive Producer Kourtney Kang Executive Producer