The Dog Training School promises Dennis's father that they can turn Gnasher into a perfect pooch. Dennis, Curly and Pie-Face go undercover to save him.
With the help of some suspicious ancient deeds Walter seizes Dennis' treehouse and claims it for his own. Dennis and co smell a rat - but they must first outsmart their own booby traps and break in to ...
Walter hijacks Dennis's tree house with some fake deeds. Dennis and The Dinmakers recruit a gorilla disguised as their new lead singer to enter a Battle of the Bands.
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