While playing with a giant dog, Chipper is injured when the dog sneezes and it causes him to hit a wall. Against Steve's orders, Barry, along with Val, goes to the veterinarian's office where the dog is being kept. They then meet his young assistant who agrees to help save Chipper. Unfortunately, the vet's lazy son finds out and holds Barry and Val hostage. The young man also was responsible for the dog that Chipper was playing with to run away. Now Steve, Mark, Dan and Fitzhugh must not only save Barry and Val, but also find the giant dog, which was a valuable movie dog, before it is too late.
—Brian Washington <Sargebri@att.net>