Dr. Who, an eccentric inventor, builds a time and space machine called TARDIS. One evening, his granddaughter Susan invites her friend Ian and his girlfriend Barbara to take a look at the machine. Mistakingly activating the TARDIS, they are whisked away to a distant planet. Upon arrival, they discover a petrified forest and a massive city in the distance. Venturing into the city, they encounter the Daleks, a race of mutant creatures encased in armoured shells. The Daleks capture the travelers and inform them they are at war with another race called the Thals.

Desperate to leave and return to Earth, Dr. Who and his companions must ally themselves with the Thals and learn the secrets of their enemies. They aim to disable the Daleks' city and neutralize their threat, but face numerous obstacles and moral dilemmas along the way. As the group navigates through dangerous terrain and intense confrontations, they wrestle with themes of courage, trust, and survival in their quest to free the planet from Dalek control.