Claire Dodin as Dr. Vanessa Walters
David Shew as General Caldwell and Ailwyn
Jonny Unitas as Capt. James Scott (Season 1)
Ryan Bond as Capt. James Scott (Season 2)
Melvin Diaz as Sgt. Eddie Miller
Binja Zihhalirwa as Tanya/Taina (Season 1 and 2 up to episode 5)
Tiffany Witcher as Tanya (Season 2 episode 6 and on)
Reese Barnard as Luther (Season 1)
Lec Zorn as Luther (Season 2 up to episode 5)
Vincent C. Davis as David Rockwell
Sedric Willis as Chris Williams
Erin Suminsby as Isabelle (Izzy) Rockwell
Michelle Lainge as Lena Rockwell and Morgana La Fey
Evie Sage as Arana (Season 1)
Rachel Pulliam as Arana (Season 2 and on)
Keira Comegys-Davis as Mya
Janeane Santos as Dr. Laura Davis
Andrea Richardson as Rose
Jerry Kokich as Santa and Kris Kringle
Lynne McIntee as Katherine Kringle