Pyjamas are just pyjamas. Right? Not when they're COSMIC PYJAMAS! Something STRANGE has happened to Rosie and her brothers! Rosie's new pyjamas have led them to a dangerous discovery . . . Doctor Starkly-Bonkers has invented the DOOMBUSTER and history is all muddled up - and now the machine has been STOLEN! Can Rosie and the boys beat the Pharaohs and dinosaurs and will rice pudding REALLY stop the Vikings?