Full Circle: Part 3—Season 18

The Doctor discovers that the Deciders have been perpetuating a lie to their own people.

Full Circle: Part 2—Season 18

The Doctor and K-9 are stranded when the TARDIS is stolen by the Marshmen.

The TARDIS enters the universe of E-Space and lands on the planet Alzarius.

The Doctor must prevent Meglos from using the dodecahedron to destroy Tigella.

Meglos escapes with the Dodecahedron and the Doctor is mistakenly held responsible.

Posing as the Doctor, Meglos penetrates the underground city of Tigella.

Meglos plans to steal the ancient and powerful Dodecahedron from Tigella.

The obsessed Pangol is determined to give Argolis a future and strike back at the Foamasi.

The Tachyon Generator has aged the Doctor into a white haired old man.

The Tachyon Recreation Generator is the cause of the deaths at the Leisure Hive.