Centuries after a catastrophic meteor collision, nature has retaken the earth. In a small town in what was once England, young Ocean Mooney and the monkey-owning Duke Smiff have just dug up a 400 year-old tablet computer. Meanwhile, in the present day, Thomas Reeve and his genius cousin Kylie create the Time Tablet - a device which they hope will allow them to communicate with the future. But when the Time Tablet malfunctions live on television, Thomas and Kylie are sucked into the year 2425 - and have only 24 hours to return home, and save the future of humanity...