

30/03/1984
A race of giant Gastropods has taken over the planet Jaconda. Their leader, Mestor, now intends to cause an enormous explosion in order to spread his people's eggs throughout the galaxy, and he kidnaps juvenile twin geniuses from Earth to work out the necessary mathematical equations. Space fighters led by Lieutenant Hugo Lang are dispatched to get the twins back, but they come under attack and Lang is the sole survivor when his ship crashes on the asteroid Titan III. A newly regenerated Doctor and Peri become involved and help Jaconda's elderly former ruler Professor Edgeworth, who is really a Time Lord named Azmael, to defeat Mestor and free the planet's bird-like indigenous people from the gastropods' reign of terror. Azmael, however, sacrifices his life in the process.

Colin Baker
as The Doctor

Nicola Bryant
as Peri Brown

Maurice Denham
as Edgeworth

Edwin Richfield
as Mestor

Kevin McNally
as Hugo Lang

Dennis Chinnery
as Sylvest

Gavin Conrad
as Romulus

Andrew Conrad
as Remus

Seymour Green
as Chamberlain

Oliver Smith
as Drak

Barry Stanton
as Noma

Dione Inman
as Elena

Helen Blatch
as Fabian

Roger Nott
as Prisoner

John Wilson
as Jacondan Guard

Graham Cole
as Jacondan
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