Martian women from Mars have sent an army of killer robots to take over planet Earth, and the only hope for mankind may be a Doomsday weapon built by a mysterious inventor in this throwback sci-fi entry with a double shot of 1950s retro kitch. As killer robots descend from the sky, a hapless police officer is abducted by a UFO and a young couple finds their romantic picnic rudely interrupted by the shiny metallic invaders. Though a doomsday weapon of unimaginable power may be mankind's only defense against the powerful invaders, it could also spell the end for the human race as we know it.

When Dorset postman Clive Peacock is forced into early retirement, the years ahead look bleak. But on his last day in the job, in a moment of unexpected rebellion he makes a decision that will change his life. As he makes his final collection from the postbox in the small seaside town where he lives, he decides to deliver the letters himself, by hand, no matter the destination. Mounting his trusty bicycle, he sets off on what proves to be an odyssey of self-discovery. Pursued by the police and lionised by the media, Clive becomes both a fugitive and a reluctant hero.