When scientists in the Antarctic uncover a mysterious seed pod, the Doctor is called in to investigate. He soon realises it is extraterrestrial and extremely dangerous. At the same time, however, ruthless millionaire plant-lover Harrison Chase has learned of the find and decides he must have the pod for his collection of rare and beautiful flora. Meanwhile the pod itself harbours intelligent life with sinister plans of its own...
Cast
Tom Baker
The Doctor
Elisabeth Sladen
Sarah Jane Smith
Tony Beckley
Harrison Chase
Kenneth Gilbert
Richard Dunbar
Michael Barrington
Sir Colin Thackeray
Sylvia Coleridge
Amelia Ducat
John Challis
Scorby
Mark Jones
Arnold Keeler / Krynoid (voice)
Seymour Green
Hargreaves
Michael McStay
Derek Moberley
Hubert Rees
John Stevensen
John Gleeson
Charles Winlett
Ian Fairbairn
Doctor Chester
John Acheson
Major Beresford
Ray Barron
Sergeant Henderson
Alan Chuntz
Chauffeur
David Masterman
Guard Leader
Harry Fielder
Guard
Pat Gorman
Guard
Ian Elliott
Guard
Keith Ashley
Sir Colin's Aide, The Krynoid
Ronald Gough
Marine, The Krynoid
Patrick Milner
Marine
Barry Summerford
UNIT Soldier
Tony Snell
UNIT Soldier
Patrick Ginter
UNIT Soldier
Rowland Geall
UNIT Soldier
Derek Wayland
UNIT Soldier
Crew
Douglas Camfield
Director
Robert Banks Stewart
Writer
Robert Holmes
Script Editor
M.A.C. Adams
Editor
Philip Hinchcliffe
Producer
Graeme Harper
Production Assistant
Jeremy Bear
Production Design
Roger Murray-Leach
Production Design
Keith Hopper
Camera Operator
Barbara Lane
Costume Design
Ann Briggs
Makeup Artist
John Holmes
Sound
Vic Godrich
Sound
John Dixon
Lighting Director
Clive Potter
Lighting Technician
Richard Conway
Visual Effects
Geoffrey Burgon
Original Music Composer
Terry Walsh
Fight Choreographer
Dick Mills
Special Sound Effects
George Gallaccio
Production Manager
Delia Derbyshire
Theme Song Performance
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