Peter Dyneley
Jeff Tracy / Preston (voice)
Shane Rimmer
Scott Tracy (voice)
Jeremy Wilkin
Virgil Tracy / Dr. Pringle / Saunders / TV Reporter / 1st Santa (voice)
Matt Zimmerman
Alan Tracy (voice)
David Graham
Gordon Tracy / Brains / Kyrano / Straker / 2nd Santa (voice)
Ray Barrett
John Tracy / Scobie / Harman / Security Chief Joe (voice)
Sylvia Anderson
Lady Penelope Creighton-Ward / Nicky / Nurse Nimmo (voice)
Christine Finn
Tin-Tin Kyrano / Grandma Tracy (voice)
Charles Tingwell
Dr. Lang / Tanner (voice) (uncredited)