Doctor Who (1963) Season 21 Episode 7 Frontios (1)

The Doctor, accompanied by his companions Tegan and Turlough, materialize the TARDIS on Frontios, a planet on the edge of the universe, where they find a small group of humans living in caves after their spacecraft was destroyed in a meteorite storm. The Doctor becomes suspicious of a group of marooned survivors using a machine to build tunnels underground and finds that they are being controlled by a mysterious entity known as the Tractators. The Tractators, who are able to manipulate gravity, have enslaved the humans to mine for a rare mineral called Trionic ore, which they need to fuel their technology.

As the Doctor investigates, he discovers that the Tractators are not native to Frontios but have been lured there by a distress signal deliberately sent by the survivors to attract help. The signal was sent by an evil scientist named Brazen, who is conspiring with the Faction, a group of people who believe that the only way to survive is by exploiting the Tractators' power.

The Doctor, Tegan, and Turlough team up with the trapped survivors to stop the Tractators and Brazen's plans. They devise a plan to lure the Tractators into a trap using the stolen technology and drive them off Frontios, saving the planet and its inhabitants from enslavement and destruction.

As the Doctor and his companions prepare to leave Frontios, they are confronted by a mysterious figure who warns them of future dangers and disappears. The Doctor wonders what lies ahead for them in their travels as the TARDIS dematerializes once again.

Frontios (1) is a thrilling sci-fi adventure, full of suspense and mystery. The episode explores themes of exploitation, power, and the consequences of our actions. The Doctor is at his best, using his intellect and ingenuity to save the day, while Tegan and Turlough provide strong supporting roles. The Tractators are an intriguing and threatening antagonist, and the twist involving Brazen and the Faction adds complexity to the story. Overall, Frontios (1) is a must-watch for Doctor Who fans and sci-fi enthusiasts alike.