On the planet Vortis, the Doctor and his companions aid the butterfly-like Menoptra in their battle against the parasitic Animus and its mind-controlled minions, the ant-like Zarbi.
Cast
William Hartnell
The Doctor
Jacqueline Hill
Barbara Wright
William Russell
Ian Chesterton
Maureen O'Brien
Vicki
Catherine Fleming
Animus (voice)
Roslyn de Winter
Vrestin
Arne Gordon
Hrostar
Arthur Blake
Hrhoonda
Jolyon Booth
Hlynia
Jocelyn Birdsall
Hlynia
Martin Jarvis
Hillo
Ian Thompson
Hetra
Barbara Joss
Nemini
Robert Jewell
Zarbi
Jack Pitt
Zarbi
Gerald Taylor
Zarbi
Hugh Lund
Zarbi
Kevin Manser
Zarbi
John Scott Martin
Zarbi
Crew
Richard Martin
Director
Bill Strutton
Writer
Dennis Spooner
Script Editor
Gitta Zadek
Editor
Verity Lambert
Producer
John Wood
Production Design
Peter Hamilton
Camera Operator
Daphne Dare
Costume Design
Sonia Markham
Makeup Artist
Ray Angel
Sound
Ralph Walton
Lighting Director
Les Structures Sonores
Music
Roslyn de Winter
Choreographer
Delia Derbyshire
Theme Song Performance
