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.
The Colonel has a shiny new tank called Monty, and Dennis is determined to have a ride in it! After pranking show-and-tell with a little help from Harley the pig, Dennis ends up in boot camp... with the Colonel as drill sergeant. Result! But when Gnasher accidentally 'borrows' Monty the tank, he causes chaos on the streets of Beanotown - and promptly has the tank confiscated by Sergeant Slipper and Parky Bowls. The menaces make it their mission to recover the tank at all costs... will there be medals all round, or will it be the scrapyard for poor Monty?