Daleks’ Invasion Earth: 2150 A.D.

The Daleks intend to drop a bomb into the Bedfordshire mineshaft that will destroy Earth's core. They then plan to replace the core with a device that would allow them to pilot the entire planet like a giant spacecraft, effectively giving them control over Earth itself.

Earlier in the film, the resistance learns that the Daleks are operating a massive mining operation, though its true purpose is not immediately clear.

Robomen are humans who have been captured and brainwashed by the Daleks. They are forced into servitude, working in the mines and serving as obedient soldiers. The Daleks use a radio link to command the Robomen, though Dr. Who later exploits this same link to turn the Robomen against their masters.

The film establishes early that captives are either turned into Robomen or forced to labour in the mines, showing the Daleks' systematic approach to human subjugation.

Dr. Who seizes the radio link to the Robomen in the mine control room and broadcasts an order commanding them to turn against their masters. This triggers a rebellion from within as the brainwashed humans attack the Daleks, creating a critical distraction during the final battle.

The Daleks' reliance on the radio link to control the Robomen is established when Dr. Who and Tom are first captured, making this reversal both surprising and logically consistent.

Tom and Conway create a deflecting ramp in the old mineshaft using timber. When the Daleks release their bomb, it deflects off the ramp and detonates at the convergence point between Earth's magnetic poles. The resulting energy release pulls the Daleks into the Earth's core, destroying them while sparing the planet.

Conway reveals that the old shaft leads to the magnetic pole convergence, providing the critical information needed to devise the deflection plan.

After the Daleks are defeated, Tom asks to be returned a few minutes before the robbery occurred. He wants to prevent the burglary so he can arrest the thieves himself and receive the promotion he was promised as a Special Constable.

Tom's motivation is established early when he mentions expecting a promotion for his police work, making his desire to return to that moment a logical character beat.

Susan writes a message on the wall of the underground station about the group's intentions to hide in London's outskirts. When Dr. Who and David return to the station, the location has become deserted and they fail to see the message, incorrectly assuming the others have gone to Bedfordshire.

The message is written quickly during the group's escape, and the subsequent chaos forces them to leave before Dr. Who can return to find it.

Wyler and Susan take shelter in a cottage occupied by a mother and daughter. The daughter leaves on an errand but returns with Daleks, who capture Wyler and Susan and take them to the mine control centre.

The daughter's seemingly innocent errand creates suspicion, and the Daleks' presence suggests they have informants among the human population.

Conway enters the mineshaft with Tom to set up the deflection ramp. When they are discovered by a Roboman, a fight ensues and both Conway and the Roboman fall to their deaths. Tom then completes the deflection setup alone.

Conway's determination to help the resistance despite being a prisoner establishes his brave character, making his sacrifice meaningful.

Brockley, a black marketeer, agrees to smuggle Dr. Who and David into the mining complex. However, after leading them to the tool shed, he leaves initially refusing to get further involved. He then returns with a group of Daleks, apparently to betray the heroes, but the Daleks fire on him, killing him before he can explain.

Brockley's dual nature as a survivalist who briefly chooses sides sets up his tragic end, demonstrating the perilous ambiguity of those trying to survive under Dalek occupation.

After the resistance group commandeers a van to escape London, Dortmun is killed by a Dalek patrol. Wyler and Susan are forced to abandon the vehicle just before it is destroyed, leaving them without transportation.

Dortmun's role as the resistance bomber planner establishes his importance, making his death a significant setback for the rebellion.

During the rebel attack on the Dalek spaceship, Dr. Who escapes with David while Tom and Louise remain trapped aboard as the craft takes off for Bedfordshire. They are unable to escape until the spaceship lands at the mining complex, where they finally manage to break free.

The failed rebel attack leaves Dr. Who separated from his companions, creating two parallel storylines that eventually converge at the mine.