- Lesley-Ann Brandt - Lamia
- Bruce Campbell - Santa
- Michelle N. Carter - Dr. Ann Mills
- Joanne Spracklen - Bo Peep
- Lea Zawada - Katie Bender
- Robert Wu - Sterling Lam
- Ernie Reyes Jr. - Monkey King
- Gia Carides - Lenore Jones
- Steven Weber - Saint of Thieves
- Gloria Reuben - Jade Wells
- Margaret Avery - Eleanor Darnell
- Eric Allan Kramer - Olafsson
- Samuel Roukin - Darrington Dare
- Howard Charles - Ambrose Gethic
- T.J. Ramini - Robbie Bender
- Katie Michels - Sally
- Dilshad Vadsaria - Sarina
- Nora Dunn - Janet Hedge
- Andrew Lewis Caldwell - Jeff
- Britney Young - Aurora
- Rhyan Schwartz - Schmidt
- Joseph Bertót - Dennis
- Jeanine Jackson - Dolores Peppers
- Luke Cook - Dorian Gray
- Luke Schuck - Sami
- James Sweet - Adel
- Ben Andrews - Brad
- Daniel Brockley - Amos
- Rick Espaillat - Doctor
- Robin Douglas - Nurse
- Jon Bebe - Hawkins
- Ulric Dihle - Screener
- Gary Powell - Diplomat
- Tricia Helfer - Karen Willis
- Tyler Mane - Minotaur
- Sean McGrath - Mr. Franklin
- Sonya Davis - Jennie
- Mathew Bostrom - Henry Birch
- Jim Jefferies - British Santa
- Cathy Vu - Paramedic Glover
- Tim Gouran - Ian
- Paul Bernard - Barkeep
- Cary-Hiroyuki Tagawa - Mr. Drake
- Jimmy Garcia - Dobra
- René Auberjonois - Mr. McGuire
- Ted Rooney - Sheriff Heyer
- Sophia Mitri Schloss - Jamie
- Kate Alden - Liza
- Aparna Brielle - Flirty Waitress
- Gary Kraus - Naked Mayor
- Chrisse Roccaro - Arguing Woman
- Brendan Quinlan - Arguing Man
- Alicia Witt - Lucinda McCabe / Morgan le Fay
- Bex Taylor-Klaus - Amy Meyer
- Amy Farrington - Amy's Mother
- Jacob Bean-Watson - Dashell
- Maxwell Chase - Leonard
- Billy Boudavong - Tim
- Tom Dang - Jonah
- Sam Kamerman - Sarah
- Haley Webb - Mabel Collins
- Robynn Hayek - Diner Waitress
- Matt Frewer - Dulaque
- Cara Mitsuko - Tech
- Mike Pfaff - Militia Man
- Nina Seničar - Isabella
- Jennifer Rowe - Researcher
- Pat Janowski - Scientist
- John Zoller - Guard #1
- Brandon Marino - Guard #2
- Michael Gladis - Frankenstein's Monster
- Jeff Fahey - Isaac Stone
- Julia Prud'homme - Sheriff Macready
- Kevin T. Williams - Andy
- Jerry Bell Jr. - Worker
- Kasha Kropinski - Lucy Lyons
- Jasmine Wright - Mindy
- Robert Pescovitz - Professor Roger Bancroft
- Kelsey Norene - Madison
- Tristan Decker - Justin
- Mary Jon Nelson - Co-Ed
- Nathan Woodworth - Student
- Drew Powell - Ray / Spirit of the Library
- Michael Trucco - Sam Denning
- John de Lancie - Sesselman
- Matt Nolan - Jefferson Keating
- Kanani Rose - Brandy Vargas
- Lucy Paschall - Naomi Vantz-Cooper
- Razaaq Adoti - Doorman
- Austin Hillebrecht - Photographer
- Hailee Keanna Lautenbach - Woman #3
- Ian Bell - Bart Hoskins
- Hayley McLaughlin - Ariel
- David Meyers - Interpol Agent
- Lowell Deo - NASA Official
- Lex Damis - Thug
- Lex Damis - Priest
- Richard Cox - Prospero
- David S. Lee - Moriarty
- David Ury - William Shakespeare
- Nathan Kornelis - Shakespeare's Assistant
- Rob Nagle - Barry
- Kendall Wells - Hammer Man
- Kendall Wells - DOSA Guard
- Lori Ferraro - Deidre
- Bob Olin - Sully
- Matt Lasky - Colin
- Patrick Kwan - Patient #2
- Jane Curtin - Charlene
- Usman Ally - Security Lt. Becker
- Aaron Washington - Tom McCormick
- Hannah Barefoot - Kelly Nelson
- Brian Adrian Koch - Greg
- Dana Green - Sergeant Reuben
- Ginifer King - Meredith
- Darius Pierce - Finklestein
- Shannon Day - Hotel Clerk
- Koby Kumi-Diaka - Tyson Lopez
- Buster Reeves - The Reaper
- Sean Astin - The Amazing Mysterium / Kirby
- Felicia Day - Charlotte
- Elisha Henig - Vern
- Nicole McCullough - Young Charlotte
- Brice Fisher - Young Kirby
- Ryan Tresser - DoSA Agent
- Ithica Tell - Bumper Car Attendant
- Vanessa Williams - Cynthia Rockwell
- William Morgan Sheppard - Teddy Chislington
- Andrew Harris - Sam Linsky
- Rachael Perrell Fosket - Cindy Kroger
- Julian Acosta - Adamski
- Jayne Taini - Agnes
- Paige Johnson Jones - Ellie Harris
- Emily Kimball - Lindsey Harris
- Rod Pilloud - Sam
- Jean-Luc Boucherot - Pierre
- Kelsi Umeko - Show Host
- Natasha Ward - Guard #2
- Christopher D. Harder - Guard #3
- Clara Lago - Estrella
- Rafael Cebrian - Tomas
- Norma Maldonado - Sofia
- Aaron Blakely - Marco
- Kc Guyer - Seth
- Amin El Gamal - Apep
- Bob Newhart - Judson
- Michelle Lee - Major Domo
- Shaunyce Omar - Pedestrian
- Todd Van Voris - Superintendent
- John J. Joseph - Victor Finch / Norman
- Rachel Nichols - Nicole Noone
- John Noble - Monsignor Vega
- Beth Riesgraf - Lady of the Lake
- Tim Harrold - Cop
- Richard Kind - Bennie Konopka
- Sunny Mabrey - Fortuna
- Nate Scholz - Slayton
- Ayanna Berkshire - Dr. Njenga
- Gray Eubank - Vernon
- Patricia Ferguson - Charity Jones
- Ashley Noelle Jackson - Mercy Jones
- Mikki Lipsey - Grandma Rose
- Edward Stiner - Chess Player
- Jason Lee Daniel - Triad Leader
- Kevin Warren - Guard
- Orianna Milne - Madeline Kincaid
- Tony Doupe - Tony Schazzola
- J.P. Manoux - Preacher / Dradok / Bartender
- Rich Morris - Dirk as Mac
- Camila Greenberg - Margaret as Kitty
- Timothy Eulich - Vincent
- Timothy Eulich - DOSA Guard
- Hank Cartwright - Sheriff
- Kent Loomer - Bouncer
- Kathy Hsieh - Shhhhhh Woman
- Jeb Berrier - Mr. Tanner
- Erin McGarry - Mrs. Tanner
- Edwin Collier - Older Mr. Pete Worth Sr.
- Brady Rubin - Older Mrs. Cathy Worth
- Joe Ross - Carstairs
- Wrick Jones - Old Man Baby
- Christopher Heyerdahl - Grigori Yefimovich Rasputin
- Efka Kvaraciejus - Dimitry
- Greg Sproles - Ivan
- Delpaneaux Wills - Attendant
- Renato Solpietro - Mourner
- Jeremiah Birkett - Agent Tannen
- James Luster - Duke Kellog
- Harold Phillips - Camper
- Dana Davidson - Camper
- Todd A. Robinson - Roach Peters
- Shawn Law - Troy
- Dan Considine - Griz
- Lucas Oktay - Milton Loveday
- J.J. Johnston - General Uriah Loveday
- Jeffrey Arrington - Ghost Union Soldier
- Bradley Goodwill - Doctor
- Dedra D. Woods - Producer
- Susannah Mars - Group Leader
- Jason Adkins - Guard
- David Bodin - Supervisor
- Sherri Saum - Karla
- Benjamin Flores Jr. - Freddy
- Heath Koerschgen - Councilman Weeks
- Erica Sullivan - Fairy
- Lorraine Bahr - Penelope
- Emily Sahler - Sylvia
- Tee Dennard - Townsfolk #1
- Eric Newsome - Mailman Dave
- Skyler Verity - Graham
- Tyler Saum - Dante
- Noah Wyle - Flynn Carsen
- Jerry O'Connell - Lancelot du Lac (uncredited)
- Rachel Olschan
- Noah Wyle
- Dean Devlin
- Scott Francisco
Sean Astin hace el papel de The Amazing Mysterium / Kirby.
Alicia Witt interpreta a Lucinda McCabe / Morgan le Fay en la serie.
John Noble hace el papel de Monsignor Vega.
Nora Dunn interpreta a Janet Hedge en la serie.
Jerry O'Connell interpreta a Lancelot du Lac (uncredited) en la serie.
Rebecca Romijn interpreta a Eve Baird en la serie.
Christian Kane interpreta a Jake Stone en la serie.
John Harlan Kim interpreta a Ezekiel Jones en la serie.
Lindy Booth interpreta a Cassandra Cillian en la serie.
John Larroquette interpreta a Jenkins en la serie.
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