When Dynomutt and Blue Falcon arrive in Crystal Cove, they team up with our Mystery Inc. gang to solve the mystery of a horrible Dragon-man Robot that's terrorizing the city. But, the Dragon is searching for something…and manages to kidnap Blue Falcon and Scooby…thinking that Scooby is Dynomutt! It's soon discovered the Dragon is working for Dr. Zin – Dr. Quest's nemesis. And Zin is searching for the ultimate power source that Blue Falcon had many years ago. The gang teams up with Dynomutt and flies the Falcon Car to Dr. Zin's evil volcano lair where an epic battle ensues. The power source is revealed to be actually inside Dynomutt…it's what powers him and keeps him alive. But, it also turns out that
the Dragon-man Robot isn't a robot at all. It's Dr. Zin's evil daughter trapped inside the suit and he's trying to save her.