When the gang's sausages go missing, and they discover gnashed bicycle wheels and one of Gnasher's teeth, it seems like there's only one suspect. But Dennis refuses to believe that Gnasher is to blame. Gnasher realizes he's being set up by Clawdia, Walter's ultra sneaky cat, and has to find a way to prove his innocence.

When Gnasher gnashes Walter's portrait, he gets revenge with a titanium sausage that leaves Gnasher toothless and miserable. Dennis and the gang decide to stage a heist to 'borrow' some diamonds until Gnasher's teeth grow back!