The Doctor manages to thwart the Cybermen's plan to destroy Voga by delivering Cyberbombs to the heart of the planetoid. But the Cyberleader has another plan, and the Doctor must convince the Vogans to give him enough time to rescue Sarah Jane before they launch their rocket.
Elenco: William Hartnell , Patrick Troughton , Jon Pertwee , Tom Baker , Peter Davison , Colin Baker , Sylvester McCoy .