The Antarctic, the near future. A strange seed-pod is unearthed from 20-thousand-year-old ice. The Doctor and Sarah go to investigate, but are too late to prevent the pod infecting a scientist and unleashing a threat to all animal life on Earth...
Quest roles:
Seymour Green(Chamberlain), John Gleeson(Charles Winlett), Tony Beckley(Harrison Chase), John Challis(Scorby), Hubert Rees(John Stevenson), Michael McStay(Derek Moberley), Kenneth Gilbert(Richard Dunbar), Michael Barrington(Sir Colin Thackeray), Mark Jones(The Krynoid (voice))