On screen
Cast
13 credited performers
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
Artwork unavailable
Keith Ashley
Zygon
Artwork unavailable
Ronald Gough
Zygon
Artwork unavailable
Lillias Walker
Sister Lamont
Angus Lennie
Angus
Artwork unavailable
Tony Sibbald
Huckle
Artwork unavailable
Hugh Martin
Munro
Robert Russell
The Caber