A single and lonely woman finds the seemingly perfect man to date, but soon regrets it when his deranged and possessive other personality emerges and worst still, she cannot convince anyone else of his Jekyll/Hyde true nature.

John Brown is a bumbling but well-intentioned security guard who is badly injured in an explosion planned by an evil mastermind. He is taken to a laboratory, where Brenda, a leading robotics surgeon, replaces his damaged limbs with state-of-the-art gadgets and tools. Named "Inspector Gadget" by the press, John — along with his niece, Penny, and her trusty dog, Brain — uses his new powers to discover who was behind the explosion.