

31/01/1976
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...

Tom Baker
as The Doctor

Elisabeth Sladen
as Sarah Jane Smith

Tony Beckley
as Harrison Chase

Kenneth Gilbert
as Richard Dunbar

Michael Barrington
as Sir Colin Thackeray

Sylvia Coleridge
as Amelia Ducat

John Challis
as Scorby

Mark Jones
as Arnold Keeler / Krynoid (voice)

Seymour Green
as Hargreaves

Michael McStay
as Derek Moberley

Hubert Rees
as John Stevensen

John Gleeson
as Charles Winlett

Ian Fairbairn
as Doctor Chester

John Acheson
as Major Beresford

Ray Barron
as Sergeant Henderson

Alan Chuntz
as Chauffeur

David Masterman
as Guard Leader

Harry Fielder
as Guard

Pat Gorman
as Guard

Ian Elliott
as Guard

Keith Ashley
as Sir Colin's Aide

Ronald Gough
as Marine

Patrick Milner
as Marine

Barry Summerford
as UNIT Soldier

Tony Snell
as UNIT Soldier

Patrick Ginter
as UNIT Soldier

Rowland Geall
as UNIT Soldier

Derek Wayland
as UNIT Soldier

Keith Ashley
as The Krynoid

Ronald Gough
as The Krynoid
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