The Cybermen plan on destroying Earth in order to prevent the destruction of their home world, Mondas. The Doctor also discovers the Cyber Controller is far from dead.
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
Adventure, Drama, Sci-Fi
Maybe also available here.