Dimension 404 is an American science fiction black comedy anthology series[1] created by Desmond "Dez" Dolly and Will Campos, and co-created by Dan Johnson and David Welch.

Its title is taken from the 1950s radio program Dimension X and the HTTP status code 404, which signifies an error due to a webpage not being found.

The six-episode anthology was ordered to series at Hulu in February 2016, with Dolly taking on the role of showrunner.

[2] Freddie Wong, Matthew Arnold, and Dolly were also reported to serve as executive producers on the series, as well as undertaking directing duties for individual episodes.

[6] That same month, Megan Mullally and Constance Wu were cast to appear in the same episode.