Jon Pertwee
Dr. Who
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
Sheila Dunn
Petra Williams / Dr Petra Williams
Derek Newark
Greg Sutton
David Simeon
Private Latimer
Derek Ware
Private Wyatt
Walter Randall
Harry Slocum
Ian Fairbairn
Bromley
Roy Scammell
RSF Sentry
Keith James
Patterson
Peter Thompson
Primord
Philip Ryan
Primord
Walter Henry
Primord
Pat Gorman
Primord
Dave Carter
Primord
Barry Letts
Loudspeaker Voice
Derek Martin
UNIT Soldier
Terry Walsh
UNIT Soldier
Ian Elliott
UNIT Soldier
Alan Chuntz
UNIT Soldier
Alan Clements
Technician Phillips