Danny Dyer goes on a quest to spot a UFO, spurred on by a meeting with his boyhood hero Sir Patrick Moore.
Danny examines reported UFO landing sites and the sinister evidence that aliens may have been conducting scientific experiments here in Britain.
He meets witnesses who claim to have seen UFOs and one man who says he can prove he's been abducted by aliens.
Danny's search for his own close encounter takes him all the way to the UFO Research Centre in Portland, Oregon.
Watch the full documentary now (playlist)