Good Omens: The Nice and Accurate Prophecies of Agnes Nutter, Witch is a 1990 novel written by the English authors Terry Pratchett and Neil Gaiman.

There are attempts by the angel Aziraphale and the demon Crowley to sabotage the coming of the end times, having grown accustomed to their comfortable surroundings in England.

However, due to several misunderstandings at the hospital, the real Antichrist is actually another boy, Adam Young, who grows up unnoticed in idyllic Lower Tadfield, Oxfordshire, together with his three close friends – Pepper, Wensleydale and Brian.

As the foretold end of the world nears, Adam begins to unknowingly use his reality-warping powers, changing the world to fit his vision of how things ought to be, such as raising the lost continent of Atlantis after reading about it in a conspiracy theory magazine, summoning UFOs after talking to his friends about aliens, and having the Amazon rainforest reclaim land lost to urban development.

Agnes's prophecies are perfectly accurate, but many are so cryptic and specific as to be nearly useless, save to the time, place and person they're meant for.

Everyone, including Shadwell's medium neighbour, Madame Tracy, converges at Tadfield Military Base, where the Four Horsemen are starting a world-ending nuclear war by tampering with the computer systems.

With Armageddon averted, Crowley and Aziraphale muse that this was God's plan all along and speculate that the real apocalyptic conflict will be between humanity and the combined forces of Heaven and Hell.

At an educated guess, although neither of us ever counted, Terry probably wrote around 60,000 "raw" and I wrote 45,000 "raw" words of Good Omens, with, on the whole, Terry taking more of the plot with Adam and the Them in, and me doing more of the stuff that was slightly more tangential to the story, except that broke down pretty quickly and when we got towards the end we swapped characters so that we'd both written everyone by the time it was done, but then we also rewrote and footnoted each other's bits as we went along, and rolled up our sleeves to take the first draft to the second (quite a lot of words), and, by the end of it, neither of us was entirely certain who had written what.

It was fairly easy to keep track of because of the way we sent disks to one another, and because I was Keeper of the Official Master Copy I can say that I wrote a bit over two thirds of Good Omens.

Initially, I did most of Adam and the Them and Neil did most of the Four Horsemen, and everything else kind of got done by whoever – by the end, large sections were being done by a composite creature called Terryandneil, whoever was actually hitting the keys.

The most significant alteration to the main text is the addition of an extra 700-word section just before the end, dealing with what happened to the character of Warlock, the American diplomat's son, who was swapped with Adam.

[15] Joe Queenan in a negative review for the New York Times wrote that Good Omens was "an experience that will persuade even the most ferociously Anglophilic Yank that the British reading public is every bit as intellectually slovenly as its American counterpart", and criticized the humor of the novel.

[16] The book has received the following awards: In 1989, a year before the completed novel was published, Gaiman and Pratchett visited the US for the World Fantasy Convention in Seattle, and shared a hotel room to save money.

Unable to sleep at night due to jet lag, and not having anything else to talk about, they started plotting out the sequel to Good Omens.

[18] When asked if Neil had any plans on releasing a sequel to Good Omens or maintaining its status as a standalone work, Gaiman stated that there was a plot for one that Pratchett wanted to be told, but that whether or not it would be made would depend on certain factors.

Neil Gaiman's Stardust (based on his own novel of the same name) and Beowulf were successful as films in 2007, which had given the adaptation of Good Omens a better chance of being picked up.

A Gilliam quote from an Empire interview appeared as follows: "And I thought with Neil, with Stardust and with Beowulf and there's another one – an animated film, a Henry Selick thing he's written Coraline – I was thinking he's really hot now, so maybe there's a chance.

[25] In February 2011, it was reported that a television adaptation may be produced, with Terry Jones and Gavin Scott "in talks" to write the series.

[26] On 19 March 2011, Gaiman announced on his website that a television series adaptation of his novel "is in the works from Terry Jones" with a link to Pratchett's webpage confirming the news.

[28][29] In April 2016, Gaiman announced that he was writing the scripts for a six-part television series as the result of a request from Pratchett, made shortly before his death.

[30] In January 2017, Amazon announced that Gaiman would adapt Good Omens into a "comedic apocalyptic" miniseries, set to be released on Prime Video in 2019.

[38] In March 2013, Cult Classic Theatre in Glasgow, Scotland, performed Amy Hoff's adaptation of Good Omens with the permission of Pratchett and Gaiman.

[39][40] In November 2017, Squabbalogic staged a special development reading of Good Omens: The Musical in Sydney, Australia with Nancye Hayes, Barry Quin and Paul Capsis.