Ep 7. A Christmas Carol (2010)

In the Doctor Who Christmas Specials season 1 episode 7, entitled A Christmas Carol (2010), the Eleventh Doctor (played by Matt Smith) decides to visit a remote planet in the future, where a man named Kazran Sardick (played by Michael Gambon) holds the key to saving the lives of thousands of people.

Kazran is a bitter and ruthless man, who controls the skies over his planet with the use of a cloud belt that he inherited from his father. However, the cloud belt is malfunctioning and it is causing a spaceship full of people to crash into his planet on Christmas Eve. The Doctor needs Kazran's help to change the timeline and save the lives of the people on board the spaceship.

To get Kazran's cooperation, the Doctor decides to take him on a journey through time to show him the error of his ways. The Doctor takes Kazran on a series of adventures, visiting him at different points in his life. During their travels, they encounter a young girl named Abigail (played by Katherine Jenkins), who has a beautiful singing voice. Abigail steals Kazran's heart, but she is tragically only able to live for a single day each year due to her cryogenic state. Kazran grows to love her and becomes desperate to find a way to save her life.

As the Doctor and Kazran continue to travel through time, they begin to see that Kazran's actions have had far-reaching consequences in his life and in the lives of those around him. The Doctor uses these experiences to teach Kazran about the value of empathy and the importance of taking responsibility for one's actions.

As the clock ticks down to Christmas Eve, the Doctor and Kazran must work together to save the spaceship full of people and find a way to save Abigail's life. The episode is filled with heartwarming moments, holiday cheer, and a sense of wonder and adventure that is truly unique to the Doctor Who universe.

Overall, A Christmas Carol (2010) is a touching and moving episode of Doctor Who that captures the spirit of the holiday season while also exploring deeper themes about the human experience. With excellent performances from the cast and stunning visuals, it is a must-watch for Doctor Who fans and anyone who loves a good holiday story.