Dennis and his faithful hound Gnasher are out to make every day as much fun as possible, but their adventures often lead them into trouble. Dennis and co race against time (and specially appointed playground patrol guards Walter and co) to escape detention, in order to witness the unveiling of Mayor Scrimp's proud new statue... which Dennis and Gnasher have made some, ahem, modifications to. Will Gnasher be able to lead the gang to freedom or will they all be stuck in the dog house until it's too late?