In this bold, adrenaline-fueled new comedy drama, the news that a comet is on an unavoidable collision course with Earth sets in motion the most hilariously unexpected chain of events imaginable. Set against the backdrop of apocalyptic chaos, the story follows an eclectic group of seemingly unconnected characters around the world as their lives start to intersect in the most unexpected ways. And when we say "eclectic," we mean a rebellious priest, an unhinged white supremacist, a mild-mannered bank manager, a germophobic cyber terrorist and an American five-star general. Some of these misfits are destined to make it to a bunker deep beneath the English suburb of Slough, and as a result will become the hugely unlikely (and totally unsuitable) future of mankind. Wouldn't that be a disaster!
Slough bank manager Jamie’s birthday is rocked when he is arrested on suspicion of being an international cyber terrorist. Interrogated by police, he is confronted by a recent photograph of his wife Layla, who he hasn’t seen or heard from since she mysteriously vanished seven years ago. In New Mexico, librarian Rhonda is thrown behind bars after taking the rap for her teenage son Spike, who hacked into the NSA’s computer system. Inside, she unwittingly falls under the wing of sharptongued white supremacist Leanne. Meanwhile, suffocated by life in a convent, Sister Celine heads to the Vatican to interview for the role of research assistant to unconventional Devil’s Advocate, Father Jude. When news comes of the impending apocalypse, chaos breaks out. Rhonda makes her escape, but finds it hard to get away from Leanne. Back in Slough, the announcement prompts Jamie’s mum to make a huge admission.
Jamie enlists the help of his flatmate Dave as he embarks on a mission to find his missing wife Layla, while Fr Jude asks for the assistance of Sr Celine when he is given a the job of searching for the second coming of the Messiah. Rhonda is determined to return to her husband and son before the world comes to an end, but the leader of shadowy cyberterrorist group Deux Ex Machina has other plans for her.
Fr Jude and Sr Celine try to help a young girl escape an angry mob that believes she is the Messiah, while Jamie's search for his birth mother grinds to a halt when he is again mistaken for Ariel. Rhonda's brother Scotty kickstarts the US government's Operation Saviour, while her and Leanne's bid to rejoin their families is scuppered when she is arrested for stealing clothes.
Rhonda horrifies herself when she realises she will do anything to maintain her freedom, while Fr Jude proves the depths of his conviction to Celine as they and a new Messiah investigator rush to stop a man from jumping off a building. Jamie finally arrives at his birth mother's mental health facility and Ariel reveals his surprising motive for hacking into the NSA's systems - and then stumbles upon the US government's biggest secret.
Jamie makes a discovery that leaves him feeling completely betrayed, while Ariel sends Scotty a worrying video message. Rhonda realises she can't trust anyone when she comes face to face with Leanne's husband and the sexual tension builds between Sr Celine and Fr Jude.
Deeply unhappy about the choices he has made in the name of professional duty, Scotty tries to make amends. However, his actions fail to go down well with Gaines. Back in Slough and back in his rut (much to Paula and Dave’s despair), Jamie’s life receives another shake-up when a sudden tragedy prompts his father to get in touch.
Scotty is forced to choose between sister Rhonda and Operation Saviour when he spots a crucial error in the plan to save the world. With just two weeks to go until impact, Messiah hunters Celine and Jude investigate a marriage cult on a holiday island. Plus, Ariel embarks on a threatening mission. And, eager for answers, Jamie travels with Dave to what he believes is Layla’s home, where the danger proves far from over for him and those close to him.
Jamie seriously underestimates Ariel’s intelligence when the pair come face to face in uncertain circumstances. Meanwhile, with their apocalypse plan in motion, Scotty, Gaines and the team anxiously wait to see if they have done enough to save the world. Plus, Celine is forced to make a major decision about her future, and there are huge consequences when Father Jude makes a daring stand against the Vatican hierarchy.
Jamie panics when he finds himself separated from Layla and Frankie just 24 hours before the end of the world, but his luck could be about to change when he strikes a deal with his grandmother. Meanwhile, a recent tragedy causes Sr Celine to return to Slough, the President gets a nasty shock when he arrives at the bunker and Rhonda and Leanne force down their last meal before facing the firing squad.
The race is on for Jamie as he struggles to assemble his loved ones, rescue Layla from the clutches of his evil twin and reach the bunker before the approaching meteor strikes. Meanwhile, Sr Celine makes a discovery that makes her want to survive the apocalypse more than ever, while those racing from America to Sutton's bunker are put in jeopardy when their plane is forced to land in a field.