A space liner, with a large number of passengers aboard, is in difficulties while flying through the atmosphere of an unknown planet. Amy and Rory have been spending some time on board in the honeymoon suite and they quickly appear on deck. Amy calls the doctor for help and the TARDIS soon appears ahead of the ship. However the Doctor cannot save them and the only other option is to land on the planet below. There the Doctor meets a Scrooge like figure by the name of Kazran Sardick, the only person that can save Amy, Rory and all the other lives on the Spacecraft. The Doctor learns that the atmosphere surrounding the planet is controlled by Kazran who is unwilling to help the liner. The only option to save the ship is for the Doctor to persuade Kazran to save the liner himself.