On screen
Cast
25 credited performers
Jon Pertwee
The Doctor
Caroline John
Liz Shaw / Section Leader Elizabeth Shaw
Nicholas Courtney
Brigadier Lethbridge-Stewart / Brigade Leader Lethbridge-Stewart
John Levene
Sergeant Benton / Platoon Under Leader Benton
Olaf Pooley
Professor Stahlman / Director Stahlman
Christopher Benjamin
Sir Keith Gold
Artwork unavailable
Sheila Dunn
Petra Williams / Dr Petra Williams
Derek Newark
Greg Sutton
David Simeon
Private Latimer
Artwork unavailable
Derek Ware
Private Wyatt
Artwork unavailable
Walter Randall
Harry Slocum
Artwork unavailable
Ian Fairbairn
Bromley
Roy Scammell
RSF Sentry
Artwork unavailable
Keith James
Patterson
Artwork unavailable
Peter Thompson
Primord
Artwork unavailable
Philip Ryan
Primord
Artwork unavailable
Walter Henry
Primord
Pat Gorman
Primord
Artwork unavailable
Dave Carter
Primord
Barry Letts
Loudspeaker Voice
Derek Martin
UNIT Soldier
Terry Walsh
UNIT Soldier
Artwork unavailable
Ian Elliott
UNIT Soldier
Alan Chuntz
UNIT Soldier
Artwork unavailable
Alan Clements
Technician Phillips