Doctor Who (1963) Season 21 Episode 9 Frontios (3)

The Doctor, Tegan, and Turlough land on the planet Frontios, which is in the process of being destroyed by meteorites. They encounter a small community of humans living underground, who are fighting to survive against the harsh conditions and other dangers on the planet. The Doctor becomes suspicious of their leader, who seems to have unlimited resources and is determined to keep the community going at any cost. As they delve deeper into the mysteries of Frontios, they uncover a dark secret that threatens to destroy the entire planet and all those living on it. With time running out, the Doctor must find a way to save the people and stop the impending disaster before it's too late.