The Seeds of Death

The TARDIS arrives on Earth where T-Mat has revolutionised travel. However, the Ice Warriors have seized control and use T-Mat to distribute Martian seed pods across the world.

The Krotons

The TARDIS takes the Doctor, Jamie and Zoe to a world where they meet the Gonds who annually send two brilliant students into the Dynatrope to be the companions of the Krotons.

The Invasion

The Doctor, Jamie and Zoe arrive in London, where they find a mysterious company where International Electromatic seem to dominate and people are disappearing. They encounter Brigadier Lethbridge-Stewart and a newly minted United Nations Intelligence Taskforce, who are also investigating the mysterious company and its leader, Tobias Vaughn.