Doctor Who: The Horns of Nimon (TV)

The inhabitants of the planet Skonnos have been promised by an alien Nimon that he will restore their empire to greatness if they in return provide young sacrifices and radioactive hymetusite crystals, both of which they are obtaining from the nearby planet Aneth. With the TARDIS immobilised for repairs, the Doctor and Romana encounter the Skonnan spaceship transporting the latest sacrificial consignment from Aneth. Romana is captured and taken to Skonnos on board the ship, while the Doctor follows in the now semi-repaired TARDIS. Once there, they are consigned by the Skonnans' leader, Soldeed, into the Nimon's labyrinthine power complex.