Sinopsis
Sin sinopsis disponible.
Director
Douglas Camfield
Reparto
Tom Baker
The Doctor
Elisabeth Sladen
Sarah Jane Smith
Ian Marter
Harry Sullivan
Nicholas Courtney
Brigadier Lethbridge-Stewart
John Levene
RSM Benton
John Woodnutt
Duke of Forgill / Broton
Keith Ashley
Zygon
Ronald Gough
Zygon
Lillias Walker
Sister Lamont
Angus Lennie
Angus
