Part 1:
The Doctor and his companions stumble upon a technologically advanced city.
Part 2:
The Doctor meets the Daleks for the first time.
Part 3:
Held hostage, the group form a plan to escape.
Part 4:
The Thals come to the city to make peace with the Daleks.
Part 5:
The Daleks have become conditioned to radiation.
Part 6:
The Daleks inform the Doctor of their plan.
Part 7:
With the aid of the Doctor, the Thals rise up against the Daleks.