The Space Pirates

The Doctor, Jamie and Zoe find themselves inside a space beacon being attacked by space pirates. The travellers are separated from the TARDIS and flung into the depths of space.

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.