Gadget is assigned to protect "Nervous Nick" Defecto, a former M.A.D. agent, from Dr. Claw's wrath. In revenge, Dr. Claw takes Chief Quimby hostage and offers him in exchange for his wayward agent.

Gadget must put a stop to M.A.D.'s latest plot for global domination, which involves the kidnapping of the world's leading solar scientists and coercing them to design and construct a solar-powered heat cannon at the grounds of mysterious Stonehenge.