Seth MacFarlane Peter Griffin , Brian Griffin , Stewie Griffin , Santa , Lee Harvey Oswald , Glenn Quagmire , Captain Seamus , Tony Danza , Tom Tucker , letter Y , Dr. Elmer Hartman Voice, Executive Producer Alex Borstein Lois Griffin , Gym Teacher Voice Seth Green Chris Griffin Voice Mila Kunis Meg Griffin Voice Mike Henry Cleveland Brown Voice Patrick Warburton Joe Swanson Voice Wallace Shawn Bertram Guest Voice Ralph Garman Letter A Guest Voice Danny Smith B.C. Guest Voice Phil LaMarr Morgan Freeman Guest Voice John Viener TV Announcer Guest Voice Chris Sheridan Curls from 'B.C' , Waiter Guest Voice Nicole Sullivan Nurse at Sperm Bank Guest Voice Tara Strong Little Baby Girl Guest Voice Chris Wedge Scrat Guest Voice Alec Sulkin Additional Voices Guest Voice Gavin Dunne Christoper Moltisanti Guest Voice Randy Crenshaw Barbershop Quartet Singer 4 Guest Voice Bob Joyce Barbershop Quartet Singer 1 Guest Voice Jon Joyce Barbershop Quartet Singer 2 Guest Voice Rick Logan Barbershop Quartet Singer 3 Guest Voice Wally Wingert Additional Voices Guest Voice David Zuckerman Executive Producer Dan Povenmire Director Pete Michels Director Peter Shin Director