The TARDIS lands on the planet Kembel and the Doctor goes to find help for the injured Steven. He discovers that the Daleks are on Kembel and are planning to conquer Earth.
Disguised as one of the members of the Dalek alliance, the Doctor discovers that the Daleks have built a deadly weapon known as the Time Destructor.
Having stolen the vital taranium core from the Daleks, the Doctor and his friends have escaped Kembel in Mavic Chen's ship but the Daleks give chase.
Arriving on Earth, the Doctor, Steven and Bret Vyon alert Vyon's friend, Daxtar, to the Dalek threat and Mavec Chen's treachery. But whose side is Daxtar really on?
The Doctor and Steven, along with Space Security Service agent Sara Kingdom are transported to the planet Mira. There, unseen creatures stalk the jungle and the Daleks close in.
Forced to return to the planet Kembel, the Doctor tries to fool the Daleks and their allies by giving them a fake taranium core – but will the Daleks see through the ruse?
Arriving in present day England, the Doctor and his companions are arrested. Escaping in the TARDIS, they find themselves on a film set before celebrating Christmas in the TARDIS.
Realising that the Doctor has tricked them and is still in possession of the taranium core, the Daleks prepare to give chase in their own time/space machine.
The TARDIS lands in ancient Egypt at the Great Pyramid. The Daleks and the Meddling Monk also arrive in pursuit of the Doctor. The Monk is forced into an alliance with the Daleks.
Steven and Sara are held hostage by the Daleks who demand that the Doctor hand over the vital taranium core, or his companions will be exterminated.
Returning to Kembel, the Doctor, Sara and Steven discover the Dalek base has been abandoned and that the leaders of the alliance have been imprisoned.
Mavic Chen proclaims himself leader of the Daleks' alliance. With the Time Destructor now complete and operational, the Doctor fears the Daleks will become unstoppable.