10 Doctor Who Episodes That Were Almost Completely Different
8. Kerblam!
The entirety of Series 11's Kerblam! is set inside a single factory, with the Doctor and her companions investigating a call for aid from an unknown worker.
But just like The Girl Who Died, the story's small scale was not the original intent, and initially, writer Pete McTighe wanted the episode to be Doctor Who's version of Star Wars: The Force Awakens, a huge space-hopping blockbuster that definitely wouldn't have been confined to a single building on a single planet.
McTighe described his vision for the episode as a "big space-opera rollercoaster", but unfortunately, his ambitious ideas had to be scaled back significantly due to the amount of money it would've cost to bring them to life.
Assuming that he still wanted to do a story based around "space Amazon" at this stage, perhaps this grander version of the episode would've shown us more Kerblam locations around the universe, since the company does operate across a vast range of planets, not just a single one.