4/4 The Cybermen are defeated and back in the TARDIS, the worn out Doctor regenerates…
3/4 To stop the Cybermen and the energy drain, General Cutler prepares to launch the Z-bomb.
2/4 Earth's energy is being drained away by the new planet, Mondas, and faces destruction…
1/4 Landing at the South Pole the travellers find a new planet is disrupting a space shot.
4/4 As Polly is held captive, the greed of the smugglers leads to betrayals and death.