Daniel "Dan" Lewis is a fictional character in the British science fiction television series Doctor Who. He was created by series producer Chris Chibnall and is portrayed by John Bishop. He first appeared in "Chapter One: The Halloween Apocalypse", the opening episode of the show's thirteenth series.
In Liverpool on Halloween 2021, Dan was abducted by Karvanista, a part of an alien invasion force intending to relocate humanity to protect them from the mysterious, galaxy-destroying phenomenon known as the Flux. Dan was rescued by Yasmin Khan and the Doctor, but even the TARDIS was unable to escape the Flux, which apparently killed them all.