Doctor Who (1963): The Morestran probe is under attack from without and within, its commander fraying under the pressure. Can the Doctor keep his promise and save them before they crash into Zeta Minor?

Starring:

Elisabeth Sladen, Frazer Hines, Jacqueline Hill, John Levene, John Scott Martin, Jon Pertwee, Katy Manning, Nicholas Courtney, Pat Gorman, Patrick Troughton, Peter Davison, Tom Baker, William Hartnell, William Russell

Genre:

Adventure, Drama, Sci-Fi