It seems like a regular, routine weekday: Sarah Jane is doing a supermarket shop (and trying not to embarrass Clyde, who is doing his work experience in Betterworth's) while Luke is at the Natural History Museum, helping to catalogue items and set up displays. But their ordinary day is about to turn extraordinary, as forces from an alien world start to affect Earth and all hell breaks loose. With an icy void opening beneath the chiller cabinet, museum exhibits coming alive and terrifying monsters appearing, Sarah Jane, Luke, Clyde and Rani are soon left fighting for their lives.