The year is 2050 and the winner of the 'Modern Housewife Cookery Competion', Mrs Gertrude Noah from Pontefract, is being given a tour of Great Britain's new space exploration vehicle, Britannia Seven. Her televised experience comes to an abrupt end when a technical fault accidentally launches the spacecraft into orbit. She is trapped on board with TV reporter Clive Cunliffe, Carstairs & Fanshaw (Technical Staff) and Garstang from Maintenance and Security.