Josh Radnor Ted Mosby Actor Jason Segel Marshall Erikson Actor Neil Patrick Harris Barney Stinson Actor Alyson Hannigan Lily Aldrin Actor Cobie Smulders Robin Sherbatsky Actor Bob Saget Narrator Katie Holmes Naomi Guest Star Christina Pickles Rita Guest Star Jack Walsh Morris Guest Star Van Epperson Shop Owner Guest Star Misty Monroe Waitress Guest Star Marlowe Peyton Kid Guest Star Dylan Shea Trick or Treater Guest Star Kevin Wayne Berger Pat Guest Star William Mulligan Santa Claus Guest Star Carter Bays Executive Producer Craig Thomas Executive Producer Tami Sagher Writer Pamela Fryman Director