An alien distress call draws the Doctor and Peri to Earth, 1985, where they uncover a Cyberman plot to change the course of history.
The Doctor
Peri Brown
Lytton
Griffiths
Russell
Cyber Leader
Varne
Bates
Bill
January 12, 1985
The Doctor
Peri Brown
Lytton
Griffiths
Russell
Cyber Leader
Varne
Bates
Bill