Ηθοποιοί επεισοδίου
Jon PertweeThe Doctor
Katy ManningJo Grant
Roger DelgadoThe Master
Nicholas CourtneyThe Brigadier
Richard FranklinMike Yates
John LeveneSergeant Benton
★
Wanda MooreDr. Ruth Ingram
★
Ian CollierStuart Hyde
★
John WyseDr. Percival
★
Neville BarberDr. Cook
★
Barry AshtonProctor
★
Donald EcclesKrasis
★
Aidan MurphyHippias
★
Keith DaltonNeophite