Dr. Who and the Daleks

Dr. Who faked the fluid link leak to force the group to venture away from the TARDIS and travel to the distant city. He knew they needed mercury to refill the component, and he used this as a strategic ruse to get them to search for supplies and help while he remained in control of the situation.

Earlier, the group had noticed the city in the distance, giving Dr. Who a clear destination to direct them toward.

The Daleks are confined to their city because the planet's high radiation levels are lethal to them outside their metal casings. They survived a nuclear war with the Thals but became dependent on their protective shells, which cannot shield them sufficiently from the radioactive environment beyond the city walls.

The Daleks mention they are trapped inside their metal casings and cannot leave due to radiation.

Susan volunteered because she was the only one still strong enough to undertake the dangerous mission. The group had contracted radiation sickness, and Susan's health was comparatively better, making her the logical choice to travel back to the TARDIS through the hazardous terrain.

Dr. Who realizes the group has contracted radiation sickness and the drugs they found may be their only chance at survival.

Once the Daleks obtained the second sample of anti-radiation drugs from the Thals, they no longer needed the Thals as trading partners. They saw an opportunity to eliminate the Thals entirely and claim the planet for themselves, viewing the Thals as a threat to be eradicated rather than a useful ally.

The Daleks discover the second drug supply and decide they no longer need the Thals.

During the struggle in the control room between the humans, Thals, and Daleks, the Daleks accidentally destroyed their own main control console. This destroyed the bomb's activation mechanism, cutting power to the city and stopping the countdown before the neutron bomb could detonate.

Ian, Barbara, and Thals infiltrate the control room where the Daleks have begun the bomb countdown.

The Thals initially refused to fight, insisting they had embraced peace. However, Dr. Who tricked Ian into taking a Thal woman to the Daleks, which enraged Alydon and convinced him that the Thals must fight to protect their people. Seeing the Doctor's willingness to sacrifice one of their own, Alydon recognized the Thals could fight for what they value.

Alydon initially refuses, insisting the Thals have embraced peace after the atomic war.

The Daleks used Susan to write a deceptive letter promising food in exchange for the Thals coming to the city. This was part of their plan to lure the Thals into a trap so they could kill them all once they arrived, eliminating the Thal threat while appearing to offer peaceful terms.

The Daleks draft a deceptive letter to the Thals promising food in exchange for safe passage.

When the Daleks tested the Thal anti-radiation drug, they discovered it caused dangerous side effects. The specific nature of these side effects is not detailed in the story, but the failure of this drug prompted the Daleks to escalate their plan by detonating a neutron bomb to raise radiation levels beyond what the Thals could survive.

Back at the Thal camp, the Doctor learns the Thal anti-radiation drug proves to have disastrous side effects.

Dr. Who tricked Ian as a calculated strategy to push the peaceful Thals into fighting. By making it appear the humans were betraying the Thals to the Daleks, he forced Alydon to recognize that only through combat could the Thals survive. This manipulation was intended to rally the Thals into assisting the assault on the Dalek city.

Dr. Who urges Alydon to mobilize the Thals to help take back the fluid link and save his people.

The Daleks did not intentionally destroy their control console. During the physical struggle with Ian, Barbara, and the Thals in the control room, the Daleks accidentally damaged their own equipment while trying to stop the intruders, causing the console to explode and rendering the bomb inoperative.

In the ensuing struggle, the Daleks inadvertently destroy their own main control console.

The Daleks seized the fluid link when they captured the travelers and kept it for examination. Throughout the story, possession of the fluid link remained crucial because it was a vital component of the TARDIS needed for the travelers to return home. The fluid link was eventually recovered during the chaotic assault on the city.

Upon arrival in the city, the travelers are seized by Daleks who take the fluid link for examination.