The Doctor, Jamie and Zoe return to Earth and become embroiled in the schemes of Tobias Vaughn. They meet up with an old friend, Colonel (now Brigadier) Lethbridge-Stewart, and some old enemies, the Cybermen.
Patrick Troughton
The Doctor
Frazer Hines
Jamie McCrimmon
Wendy Padbury
Zoe Heriot
Kevin Stoney
Tobias Vaughn
Nicholas Courtney
Brigadier Lethbridge-Stewart
Edward Burnham
Professor Watkins
Sally Faulkner
Isobel Watkins
Peter Halliday
Packer/Cyberman Voice
