John Brown is just a bumbling but well-intentioned security guard who is hurt in an explosion intended by an evil mastermind. He's taken into a laboratory, where Brenda, a leading robotics surgeon, simplifies his damaged limbs using gear and gadgets. Named"Inspector Gadget" by the press, John -- with his niece, Penny, along with her trusty dog, Brain -- uses his new powers to discover that was behind the explosion.