Midnight Entity

The Midnight Entity is a being that appears in the British science fiction television programme Doctor Who. First appearing in the 2008 episode "Midnight", the Entity attacks a tour bus on the planet Midnight, with the Entity possessing a woman named Sky Silvestry (Lesley Sharp). The Entity proceeds to mimic the voices of the other passengers, including the Tenth Doctor (David Tennant), with the Entity eventually taking control over the Doctor. The passengers on the bus attempt to throw the Doctor out of the bus, but due to the sacrifice of a hostess (Rakie Ayola), the Entity is stopped and the Doctor is freed. It reappears in the 2025 episode "The Well", where, hundreds of thousands of years after "Midnight", it attacks a mining colony set up on the planet. Now hiding behind people and whispering into their ears to play games with them, the Entity encounters the Fifteenth Doctor (Ncuti Gatwa). Though the Entity is seemingly banished back into the titular well, the episode implies it was able to escape onto an expedition team's spaceship, and survive.

Created by writer Russell T Davies, the Entity was conceived after he had a conversation with a producer for the series and the two accidentally ended up repeating each other's words. Its return in "The Well" was initially not planned, and only done after a plan by Davies to use Nigerian spirits called Orishas as antagonists fell through. Seeing that the actions of the antagonist in the story fit the general behaviors of the Entity, Davies elected to bring the Entity back for the story.

The Entity has been considered one of the most terrifying antagonists in the show's history, with many critics praising the ambiguity of the creature, particularly via its lack of physical form, as helping to create a memorable, impactful antagonist. Its return in "The Well" received more mixed responses; some critics felt it was a solid return for the Entity, though others felt it did not follow up on the initial impact of the Entity in "Midnight" effectively.