Julia Alexander, managing a struggling art gallery, wants to save her marriage with Tony, a successful, but unfaithful plastic surgeon. The British ex-pats live luxuriously with their 10 year old daughter Isabelle in Spain. Julia is serious in her intentions and persuades Tony to take an intimate boat trip together - she also ends her affair with her lover Matthew. But her best laid plans backfire as young Isabelle secretly stows away on the yacht and during their voyage they encounter another yacht stranded at sea and decide to investigate.

John Smith has been happily involved in a bigamous marriage for five years. He lives with Stephanie in Finsbury and Michelle in Stockwell. Fortunately, for John, he's a taxi driver which involves varying shift work! Simple? Well, when John unwittingly becomes a have-a-go hero and the Finsbury and Stockwell police forces discover something suspicious in their paperwork, John's happy bubble is about to be burst. The action of the movie takes place during the next hectic 24 hours as John, with the assistance of his gullible neighbor Gary, rush between North and South London attempting to thwart the police and prevent the two loving wives coming face to face!

On the same day that Tom Dunn finds out that he is to become a father again, the people of Earth become plagued with terrifying visions of the end of the world. When a gigantic, all-consuming alien mothership launches a ruthless attack, chaos and destruction follow. The ultimate war for Planet Earth is about to begin...