Which X-Files episode was filmed entirely in black and white?

“The Post-Modern Prometheus” is the X-Files episode filmed entirely in black and white. Chris Carter wrote and directed the season-five installment as a visual homage to the classic Frankenstein films of director James Whale.

The story follows Mulder and Scully as they investigate reports of a strange creature called the Great Mutato in rural Indiana. Its comic-book-inspired style, exaggerated wide-angle photography, stormy skies, and grayscale presentation give the episode an intentionally old-fashioned monster-movie atmosphere.

The black-and-white choice was more than a stylistic joke: it helped the production evoke Universal horror cinema and also made the elaborate Great Mutato makeup look more convincing. Viewers sometimes choose “Triangle” because it uses striking visual changes, but that episode was not filmed entirely in black and white.