[1] Richard Mayhew, a Scottish man living in London, encounters an injured girl named Door on the street one night.

He loses his flat, his job, and nearly his mind as he travels London Below in an attempt to make sense out of it all, find a way back, and help Door survive as she is hunted down by hired assassins.

One major problem lay in the original plan to shoot on video (for budgetary reasons), and then later "filmise" the footage to make it look as if it had been shot on film.

[4] For this reason, the programme had been lit and shot in a manner appropriate to a film-based production, but the decision to apply the filmisation process was later reversed.

Gaiman himself commented that the loss of quality resulting from multi-generational VHS copies actually improved the appearance in this respect.

The opening theme on the Region 2 DVD version is a series of abstract sounds, while the closing music remains intact.

A nine-issue graphic novel limited series began in June 2005, written by Mike Carey (who had worked on Lucifer, a spin-off from Gaiman's The Sandman), with art by Glenn Fabry.

[5] Vertigo changed a character, the Marquis De Carabas, that had been portrayed in the TV series and on the radio as a man from the African Diaspora into a creature with a black skin tone not seen in the real world.

[11] In February 2012, Calgary-based theatre company Mob Hit Productions performed a two-week run of Kauzlaric's adaptation.

[13] On 5 April 2013, the Sacred Fools Theater Company in Los Angeles performed the American West Coast premiere of Kauzlaric's adaptation.

[20][21] "How the Marquis Got His Coat Back" is a short story written by Neil Gaiman and set in the Neverwhere universe.