Nebulous is a post-apocalyptic science fiction comedy radio show written by Graham Duff and produced by Ted Dowd from Baby Cow Productions; it is directed by Nicholas Briggs.

[10] Briggs also carried out the studio editing in order to bring the 30-minute episodes down to the 28 minutes mandated by the BBC to allow time for radio trailers between programmes.

Every day of the week is now 25 hours long except for Thursday (which, due to time anomalies, has not occurred in over a decade),[14] while the change in the length of the year led to the creation of new months such as Janril, Febtober, and Marchuary.

[17] The Solar System is equally altered: Jupiter has been deep fried by Harry Ramsden's, Mercury and Neptune have been knocked together, and there was an initiative to destroy the Moon, which according to the show was deleterious to the nightlight industry.

By comparison to KENT it is over-funded and well-equipped, with bazers, black helicopters and info pills, which provide the user with information by ingestion.

[16] Nebulous both parodies and pays homage to several well known science fiction programmes and films in both its setting and plotlines, often incorporating several different elements within a single story: Professor Nebulous himself is similar to Bernard Quatermass,[9] a British scientist who led a research group and fought aliens in the classic science fiction serial The Quatermass Experiment and its sequels.

Episode 6 of that series also parodied the tendency in British sci-fi for attempts to take over the world to start in Britain, with the chief villain (played by Tenth Doctor actor David Tennant) stating "Funnily enough, that's a tax thing," as well as one of the Ninth Doctor's nicknames, "the oncoming storm" (with Nebulous known as "the oncoming drizzle").

Following positive reviews and high listening figures, the second series was able to attract a number of guest appearances from well known actors, including Peter Davison, Steve Coogan, and Kate O'Mara.

[24] A reviewer for Doctor Who website UnitNews also initially expressed concerns about the level of jokes in the show, but later claimed "I should have been more patient because when they did arrive, coinciding with the introduction of the character Harry, they were relentlessly funny".