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 Lyndsy Fonseca Daughter Guest Star David Henrie Son Guest Star Judith Drake Bernice Guest Star Saudia Rashed Nurse Guest Star Courtney Hope Turner Girl Guest Star Brooke Lynn Howard Sexy Girl 1 Guest Star Justene Alpert Sexy Girl 2 Guest Star Alexandria Sounis Erin Guest Star Patrick Kang 22-Year-Old Guy Guest Star Kerrigan Milker Young Penny Guest Star Carter Bays Executive Producer Craig Thomas Executive Producer Pamela Fryman Executive Producer Stephen Lloyd Executive Producer Chris Harris Executive Producer Chuck Tatham Executive Producer Jamie Rhonheimer Executive Producer Kourtney Kang Executive Producer