The Well (Doctor Who)

"The Well" is the third episode of the fifteenth series of the British science-fiction television series Doctor Who. In the episode, the Fifteenth Doctor (Ncuti Gatwa) and his companion, Belinda Chandra (Varada Sethu), arrive at a mining colony where contact has been completely lost. Upon investigation, they discover a sole survivor: the crew's deaf cook, Aliss Fenly. Attached to her is an alien being known as the Midnight Entity that kills anyone who steps behind her. Aliss is portrayed by Rose Ayling-Ellis, a deaf actress. The cast was trained in British Sign Language, with a consultant on set to ensure that the sign language was accurate and authentic.

The episode was co-written by Russell T Davies, the Doctor Who showrunner, and Sharma Angel-Walfall, and directed by Amanda Brotchie. It was released on BBC iPlayer, BBC One, and Disney+ on 26 April 2025. The programme was originally planned as a stand-alone focussing on Nigerian spirits known as Orishas, but for several reasons it was converted into a sequel to the 2008 episode "Midnight". Filming occurred at Pant-y-Ffynnon Quarry in Bridgend in February 2024.

"The Well" was watched by 3.24 million viewers. It received largely positive responses from critics, who highlighted the cast performances in particular. Reception to the return of the Midnight Entity was mixed, however; with some reviewers feeling that it was an effective usage of the Entity and others, that it was unnecessary and detracted from the Entity's overall mystery. A novelisation of the episode written by Gareth L. Powell was released on 10 July 2025.

Still unable to return to Earth on 24 May 2025, the Doctor and Belinda find themselves 500,000 years in the future among a group of troopers, led by Shaya, who are visiting a planet to investigate a loss of contact with its mining colony. They discover that everyone has been murdered except for Aliss, a deaf cook, who claims the miners went mad and killed each other. Another discovery is that every mirror on the base is broken.

Belinda learns that Aliss and the troopers have no knowledge of Earth or humanity, and the Doctor realises that he had visited the planet, then known as Midnight, 400,000 years earlier. One of the troopers moves behind Aliss to check if something is there, resulting in the trooper's death. Aliss reveals there is an Entity behind her: the same Entity previously encountered by the Doctor. Belinda theorises that the Entity is concealed behind Aliss and that anyone who moves behind it is killed. Aliss says the Entity will transfer to anyone who kills her. Trooper Cassio, frustrated by Shaya's lack of action in dispelling the Entity, relieves her of command. His attempts to reveal the Entity result in many troopers' deaths, and Shaya gets Cassio killed by having Aliss turn her back on him.

The Doctor attempts to communicate with the Entity and the two appear to acknowledge each other. Remembering the broken mirrors, he theorises that the Entity is afraid of its own reflection and so he has Shaya shoot the pipes containing the base's mined mercury, creating a liquid mirror and freeing Aliss.

The group then attempts to escape the colony. Aliss and two troopers leave first, but before the others can follow, the Entity latches onto Belinda. To free her, Shaya shoots Belinda in such a way that she can later be revived. The Entity seemingly transfers to Shaya, who sacrifices herself to allow the others to escape.

Belinda and the Doctor depart in the TARDIS. On a spaceship orbiting the planet, one of the soldiers, Mo, reports the events of the expedition to Mrs Flood, an enigmatic recurring character in the series. The episode ends with a trooper seeming to notice something behind Mo, suggesting that the Entity was able to escape the planet.