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In the third episode of the six-part story "The Wheel in Space," the Doctor (Patrick Troughton) tries to help the crew of the Space Wheel defense station fend off attacks from the Cybermen, while Jamie (Frazer Hines) and Zoe (Wendy Padbury) embark upon a dangerous mission to retrieve an important TARDIS component. Things take a disastrous turn when the Cybermats, the well-armed advance guard of the Cybermen, arrive on the deck of the Wheel. Scripted by David Whitaker from a story by Kit Parker, "The Wheel in Space, Part 3" first aired on May 11, 1968.