The Second Doctor and Jamie arrive on what appears to be a space station called the "Wheel in Space" it's here that they meet Zoe Herriot a young parapsychology librarian, The Doctor hits his head concussing him leaving Jamie and Zoe to defend off the Cybermen from taking over "The Wheel in Space."
Patrick Troughton
as The Doctor
Frazer Hines
as Jamie McCrimmon
Wendy Padbury
as Zoe Heriot
Deborah Watling
as Victoria Waterfield
Michael Turner
as Jarvis Bennett
Anne Ridler
as Dr. Gemma Corwyn
Eric Flynn
as Leo Ryan
Clare Jenkins
as Tanya Lernov
Kenneth Watson
as Bill Duggan
Kevork Malikyan
as Kemel Rudkin
Michael Goldie
as Elton Laleham
Derrick Gilbert
as Armand Vallance
