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"We are a people driven not by individual need but by mathematical necessity. The language of the numbers is as much as we need"
The Doctor and Adric head to Earth to fix the TARDIS's chameleon circuit — hoping to restore the time machine's ability to blend into its surroundings. Once there they face danger involving a newly regenerated Master and a feisty young air hostess named Tegan Jovanka. How can the people of the distant and mysterious planet Logopolis help? And just who is the strange, ghostly figure watching the Doctor's every move?
The Doctor: Tom Baker
The Doctor: Peter Davison
Adric: Matthew Waterhouse
Nyssa: Sarah Sutton
Tegan Jovanka: Janet Fielding
The Master: Anthony Ainley
The Monitor: John Fraser
Aunt Vanessa: Dolore Whiteman
Detective Inspector: Tom Georgeson
Producer: John Nathan-Turner
Director: Peter Grimwade
Scriptwriter: Christopher H. Bidmead