Members of the Springhill Farm Gang(SFG) design and build a new version of their raft to float on Bunkers pond. Meanwhile Percy Fieldmouse is pining for his new girlfriend Cornelia who has been kidnapped by the Rat Brothers. Percy's family hatch a plan to rescue her from the Rats and march to Bunkers to find the SFG camping with their Jack Russell dog, Jock. Percy's family together with Cornelia's family raid the Rat Den, creating confusion and chaos,...