Landing at the South Pole, the travellers find that Earth's twin planet is disrupting a space mission. The Doctor predicts that they will soon receive visitors from the new planet.
Landing at the South Pole, the travellers find that Earth's twin planet is disrupting a space mission. The Doctor predicts that they will soon receive visitors from the new planet.
Earth's energy is being drained away by the new planet, Mondas, and faces destruction. Cybermen invade the base and threaten to convert the humans into creatures like themselves.
Earth's energy is being drained away by the new planet, Mondas, and faces destruction. Cybermen invade the base and threaten to convert the humans into creatures like themselves.
Determined to stop the Cybermen and the energy drain, General Cutler prepares to launch the deadly Z-bomb. Ben and Polly desperately try to stop the launch as the countdown begins.
Determined to stop the Cybermen and the energy drain, General Cutler prepares to launch the deadly Z-bomb. Ben and Polly desperately try to stop the launch as the countdown begins.
Polly is taken prisoner by the rebels who intend to use the Daleks to take control of the colony. The Doctor discovers that all three Daleks have now been reactivated.
Polly is taken prisoner by the rebels who intend to use the Daleks to take control of the colony. The Doctor discovers that all three Daleks have now been reactivated.
As a battle rages between the rebels and the loyal colonists, the Daleks begin their attack. The only chance of survival for the colony rests with the Doctor.
As a battle rages between the rebels and the loyal colonists, the Daleks begin their attack. The only chance of survival for the colony rests with the Doctor.
The TARDIS materialises on a deserted beach where the Doctor and his friends are captured by primitive warriors and taken to the fabled city of Atlantis.
The TARDIS materialises on a deserted beach where the Doctor and his friends are captured by primitive warriors and taken to the fabled city of Atlantis.
Jamie and Ben are set to work in the mines but are determined to escape. The Doctor discovers that Zaroff's mad plans will cause the destruction of the Earth.
Jamie and Ben are set to work in the mines but are determined to escape. The Doctor discovers that Zaroff's mad plans will cause the destruction of the Earth.
The Doctor hatches a dangerous plan to kidnap Professor Zaroff and encourages the Fish People to revolt against their masters and put a stop to the production of food.
The Doctor hatches a dangerous plan to kidnap Professor Zaroff and encourages the Fish People to revolt against their masters and put a stop to the production of food.
The TARDIS lands on the Moon in 2070 and Jamie is injured during a spacewalk. The travellers are treated with suspicion at the weather control moonbase where a plague has struck.
The TARDIS lands on the Moon in 2070 and Jamie is injured during a spacewalk. The travellers are treated with suspicion at the weather control moonbase where a plague has struck.
The moonbase is cut off from Earth and under siege. The Cybermen launch an all-out attack and the Doctor formulates a dangerous plan to repel the invaders.
The moonbase is cut off from Earth and under siege. The Cybermen launch an all-out attack and the Doctor formulates a dangerous plan to repel the invaders.
The TARDIS arrives at a holiday camp company with the crew worried by a prediction of giant crabs and the Doctor becomes interested in the apparent madman Medok's stories of creatures that roam the colony at night.
The TARDIS arrives at a holiday camp company with the crew worried by a prediction of giant crabs and the Doctor becomes interested in the apparent madman Medok's stories of creatures that roam the colony at night.
When Spencer attempts to kill them, the Doctor, Jamie and Samantha become convinced Chameleon Tours are hiding something and Samantha decides to book a ticket on one of their flights.
When Spencer attempts to kill them, the Doctor, Jamie and Samantha become convinced Chameleon Tours are hiding something and Samantha decides to book a ticket on one of their flights.
Jamie finds himself aboard the Chameleons' satellite and meets their Director while the Doctor forces the Chameleon Meadows to tell him the aliens' plans.
Jamie finds himself aboard the Chameleons' satellite and meets their Director while the Doctor forces the Chameleon Meadows to tell him the aliens' plans.
The Doctor and Pinto are captured by the Chameleons but the Doctor manages to use their dependence on their human originals to create dissent in their ranks.
The Doctor and Pinto are captured by the Chameleons but the Doctor manages to use their dependence on their human originals to create dissent in their ranks.
