1. Episode 1 : Wales

In 2016, multiple witnesses in and around the village of Pentyrch, South Wales, describe seeing a vast triangular UFO appearing in the night sky, ejecting smaller red and green craft before engaging in a battle with the British Air Force, culminating in its apparent shooting down. Residents describe shaking buildings, violent explosions, inexplicably damaged trees and mysterious teams of unknown people involved in a clandestine clean-up. The official military line was that this was merely a training exercise, but those who saw the event first-hand refuse to accept this explanation.

2. Episode 2 : Ireland

Every year, thousands of UFOs are encountered by civilian and military pilots around the world. Many go unreported. Craig and Sarah scrutinise the phenomenon and take a closer look at an astonishing case that took place in November 2018 off the west coast of Ireland, in which multiple pilots saw bizarre lights through their cockpit windows.

4. Episode 4 : Rendlesham

Over the past 50 years a fascinating pattern has emerged, linking UFOs with military personnel and installations. One of the most significant of these events took place on British soil, deep in Rendlesham Forest, Suffolk, in 1980. The now infamous ‘Rendlesham incident’ involved numerous witnesses from the American Air Force who were stationed in nearby RAF Woodbridge. Craig and Sarah pore over every scrap of available evidence relating to the Rendlesham incident.

5. Episode 5 : Scotland

Central Scotland has its very own Area 51, known as the ‘Falkirk Triangle’, encompassing the now infamous village of Bonnybridge, which claims the highest concentration of the region’s UFO activity. The team examine cases including the 1991 sighting captured on camera flying over Polmont Reservoir, and the flying saucer over Craigluscar Reservoir in 1994. They also investigate the alleged abduction of Robert Taylor in 1979, the only UFO incident to have been officially investigated by the British Police.

6. Episode 6 : Phoenix Lights

In 1997, over the city of Phoenix, Arizona, one of the most spectacular mass UFO sighting of all time took place. Thousands of people witnessed a series of bright orange orbs moving in formation silently overhead. Despite hours of video and photographic evidence this case remains unexplained.

7. Episode 7 : Chicago

In this episode, Craig and Sarah take on the extraordinary Chicago O’Hare case of November 2006 – a mass sighting of a flying saucer hovering over a United Airlines airport gate. The incident was witnessed by multiple aviation professionals, pilots and passengers.

8. Episode 8 : PC Alan Godfrey / Abductions

This episode delves into the most mystifying and alarming of alleged extra-terrestrial experiences: alien abduction. The most remarkable case to have ever taken place on British soil was the infamous abduction of Yorkshire policeman Alan Godfrey in November 1980.

9. Episode 9 : Stephenville

In January 2008, a shadow was cast over the town of Stephenville, Texas, when a UFO passed overhead at supersonic speed. The event was witnessed by scores of stunned locals who remain desperate for answers on what exactly they saw that winter’s evening.

10. Episode 10 : SETI

In October 2017, astronomers at the Pan-STARRS observatory saw something strange in our solar system - an object they named ‘Oumuamua’, the very first observed visitor from interstellar space. Its highly unusual properties and inexplicable acceleration have left scientists divided, with some believing this ‘UFO’ was alien in origin.