Ep 12. Devil's Planet (3)

The Doctor and Martha land on a planet called Krop Tor, which is a planet orbiting a black hole. They soon discover a team of humans, including a famous explorer named Jefferson, who are drilling into the planet's surface in search of a valuable mineral. The Doctor quickly realizes that the planet is actually a prison, and the beings who were locked up there long ago have been awakened by the drilling. These beings, which are revealed to be the Ood, have possessed Jefferson and several other members of the team, using them as hosts to communicate with the Doctor.

As the Doctor and Martha try to unravel the mystery of Krop Tor and rescue the possessed humans, they also grapple with questions of morality and the greater good. The Ood reveal that the black hole is held at bay by six massive engines, which are powered by the human drilling operation. If the operation is stopped, the engines will fail and the black hole will consume the planet.

The Doctor is faced with a difficult decision: should he risk the lives of the possessed humans in order to save the Ood and the planet from destruction? Ultimately, he chooses to work with the possessed humans, believing that they can overcome the possession and work together to save everyone.

As the possessed humans struggle to regain control of their minds and bodies, the Doctor and Martha race to activate the engines and prevent the black hole from consuming Krop Tor. Along the way, they encounter several obstacles and unexpected twists, including a shocking revelation about the true nature of the planet.

In the end, the Doctor and his companions triumph over the forces of evil and save the day. But the episode leaves viewers with plenty to ponder, as it raises questions about the ethics of exploitation, the power of teamwork, and the things we're willing to sacrifice in order to save others.

Overall, Devil's Planet (3) is a thrilling and thought-provoking episode that keeps viewers on the edge of their seats from start to finish. With its well-crafted plot, compelling characters, and thought-provoking themes, it's a must-watch for fans of Doctor Who and science fiction alike.