The TARDIS materialises on board the Silver Carrier, an abandoned rocket where the Doctor and Jamie are attacked by a servo robot. Jamie manages to contact the Wheel, a space station that the rocket is orbiting, and the Doctor and Jamie are rescued.
Cybermats, robotic servants of the Cybermen, also on board the rocket, are also sent over to the Wheel to pave the way for an attack by the Cybermen. The Cybermen plan to use the radio beacon on board the Wheel as part of their invasion of Earth.
The Doctor sends Jamie, and an astrophysicist named Zoe Heriot, back to the Silver Carrier to retrieve the TARDIS's vector generator rod, while he manages to free the Wheel's crew from Cyber control.
On Jamie and Zoe's return the Doctor uses the rod to increase the power of the station's X-ray generator, and uses it to destroy the Cyber fleet. On leaving the Wheel the Doctor and Jamie find they have a stowaway on board - Zoe.
Regular castJamie McCrimmon: Frazer Hines; Zoe Heriot: Wendy Padbury;
Guest castJarvis Bennett: Michael Turner; Tanya Lernov: Clare Jenkins; Leo Ryan: Eric Flynn; Enrico Casalie: Donald Sumpter; Doctor Gemma Corwyn: Anne Riddler (1-5); Servo Robot: Freddie Foote (1); Victoria Waterfield: Deborah Watling (1); Sean Flannigan: James Mellor (2-6); Armand Vallance: Derrick Gilbert (2-6); Elton Lakeheim: Michael Goldie (2-5); Ken Chang: Peter Laird (2-4); Bill Duggan: Kenneth Watson (2-4); Cybermen: Jerry Holmes (2-6), Gordon Stothard (3-6); Cybermen Voices: Peter Hawkins (3-6), Roy Skelton (3-6); Kemel Rudkin: Kervork Malikyan (2);
Uncredited cast: Double for the Doctor: Chris Jeffries (2); Gemma Corwyn's Corpse: Dorothy Ford (6); Extras: Yinka Adbeyi, Harry Fielder, Ken Gibson, Tony Harwood, Chris Konyils, Angela March, Gordon Pitt, Kenn Senton, Dorothy Su, John Taylor;
|BBC 1||204||Episode 1||Sat 27 April 1968||5:15 pm - 5:40 pm||7.2M||40th|
|BBC 1||205||Episode 2||Sat 4 May 1968||5:15 pm - 5:40 pm||6.9M||59th|
|BBC 1||206||Episode 3||Sat 11 May 1968||5:15 pm - 5:40 pm||7.5M||40th|
|BBC 1||207||Episode 4||Sat 18 May 1968||5:15 pm - 5:40 pm||8.6M||28th|
|BBC 1||208||Episode 5||Sat 25 May 1968||5:15 pm - 5:40 pm||6.8M||44th|
|BBC 1||209||Episode 6||Sat 1 June 1968||6:00 pm - 6:25 pm||6.5M||51st|
This programme does not have any outside filming
Ealing Television Studios; Lime Grove Studio D; Riverside Studio 1; Television Centre Studio 1; Television Centre Studio 3;
Bloopers and mistakes
This programme has no bloopers or mistakes. It's probably not perfect, just that they haven't been found or pointed out yet.
Notes and trivia
Patrick Troughton is absent from Episode 2; a double plays the unconscious Doctor
This story sees the first use of the Doctor's pseudonym Doctor John Smith.
From Episode 2 onwards, the credits in the opening titles are brought up over the model of the Wheel.
The Space Wheel;