Doctor Who
Cast Roles: X
- Xana (Belinda Lee in Dragonfire: Part Two)
- Xander (8 episodes, e.g. Sanee Raval in Big Finish: Aliens Among Us - Part 2: Love Rat)
- Xankari/ Teacher) (Jane Slavin in Big Finish: Dethras)
- Xanxia (Queen) (Vi Delmar in The Pirate Planet: Part Three)
- Xen (Marq English in Big Finish: Singularity)
- Xeron (9 episodes, e.g. Bill Starkey in The Space Museum: The Search)
- Xiaolian (Daphne Cheung in The Pyramid At The End Of The World)
- Xiu Xiu (4 episodes, e.g. Lucy Sheen in Big Finish: Jago & Litefoot Series 13: The Stuff of Nightmares)
- Xmas Eve Drunk (Jason Weeks in The End of Time: Part One)
- Xmas Eve Office Workers (3 episodes, e.g. Robert Price in The End of Time: Part One)
- Xmas Eve Passer (7 episodes, e.g. Victoria Alderwick in The End of Time: Part One)
- Xoanon (9 episodes, e.g. Rob Edwards in The Face of Evil: Part Two)
- Xylem Maple Dorm (4 episodes, e.g. Derek Griffiths in Big Finish: Tales From New Earth: Escape From New New York)