When 12 year-old Malky and his younger brother Seb become the owners of a "Dreaminator", they are thrust into worlds beyond their wildest imagination. From tree-top flights and Spanish galleons, to thrilling battles and sporting greatness - it seems like nothing is out of reach when you can share a dream with someone else. But... impossible dreams come with incredible risks, and when Seb won't wake up and is taken to hospital in a coma, Malky is forced to leave reality behind and undertake a final, terrifying journey to the stone-age to wake his brother.