WARNING: The following contains spoilers for "The Very Last Day of the Rest of Their Lives," the series finale of Good Omens, available now on Amazon Prime Video.
Faithfully following its literary source material, the series finale of Good Omens has the angel Aziraphale and demon Crowley finally discover the true identity of the Antichrist as the Four Horsemen of the Apocalypse seize control of an American military base in England to trigger a nuclear armageddon. It is a climax where all the major players of the miniseries cross paths to either cause or prevent the end of days. However, the true hero of the day isn't the angel and demon who formed an unlikely friendship over six millennia but rather Adam Young: the Antichrist.
Having mistakenly been adopted by an unassuming English couple instead of a powerful American diplomat as the forces of Heaven and Hell intended, Adam had a loving upbringing in a quiet English town, where he made friends and adopted a hellhound. Despite his satanic heritage, Adam learned the value of his own humanity, even when his hellish powers manifested after the Horsemen arrived on Earth. Partnered with his friends, the one prophesied to trigger the end of world ends up saving it.
Using a flaming sword, each of Adam's friends dispatch the Horsemen of War, Pollution and Famine, while Death concedes, knowing resistance is futile. As Aziraphale and Crowley reveal themselves in their true forms to Adam, the boy's biological father, Satan, arrives from the fiery depths to confront his wayward son. Ordering his son to join him by unleashing the forces of Hell and claim his apocalyptic destiny, Adam uses his incredible powers to reject and dispel Satan. Adam's adopted father arrives, worried about his son, who went missing while chaos erupted around the globe. With humanity seemingly saved, Aziraphale and Crowley are summoned by their respective supervisors, their forbidden fraternizing and conspiring to avert divine prophecy having been exposed.
Back in Heaven and Hell, the angel and demon are both sentenced to be executed immediately for their open defiance of holy and unholy orders. For his execution, Crowley is dipped into a cast iron tub filled with holy water, which had previously been seen to cause demons to melt instantly upon contact. As for Aziraphale, the angel is cast into a spout of flame to burn away for his betrayal of Heaven. To the surprise of all present, both Crowley and Aziraphale are completely unfazed by the attempts to execute them. Their superiors eventually let them go free on Earth, so long as they cease meddling in divine affairs.
Upon their return to Earth, Crowley's ruse is revealed: The two had used the demon's tricks to swap appearances, with Aziraphale posing as Crowley, who is immune to holy water, while Crowley was unaffected by fire, even in Heaven. Crowley had been able to take different forms over the ages, and Aziraphale had briefly possessed the body of Madame Tracey after his own physical form had been exorcised by Witch-Finder Sergeant Shadwell. With that, the two friends enjoy an afternoon in an English park. That's when Crowley drops a major prediction for the future.
As the last witch hunter, Newt Pulsifer, and the last witch, Anathema Device, enter a serious romantic relationship, the latter burns the prophecies of her ancestor, Agnes Nutter, so she can live her life without any preconceived notions. Crowley shares with Aziraphale that the apocalypse has not been completely averted. Having failed to trigger armageddon separately, Crowley muses, Heaven and Hell will likely instead join forces to invade Earth and eradicate humanity together. Before Aziraphale can fully contemplate Crowley's prediction, the demon quickly dismisses the idea, and the two decide to get lunch, capitalizing on Aziraphale's long standing love of human cuisine.
While co-author and miniseries showrunner Neil Gaiman has adamantly and repeatedly denied the possibilities of a sequel to Good Omens, Crowley's prediction of a joint invasion of Earth by heavenly forces to create the apocalypse would provide the story with a clear direction to go next. The Horseman of Death is still on the loose, as are all the armies of Heaven and Hell, who were itching to go to war for the entire miniseries. With Adam Young back home, the adolescent Antichrist may not be enough to save the day on his own this time.
Starring Michael Sheen, David Tennant, Adria Arjona, Michael McKean, Miranda Richardson, Sam Taylor Buck, Jack Whitehall and Jon Hamm, Good Omens premieres with all six episodes May 31 on Amazon Prime.