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Gadget is assigned to halt a diabolical M.A.D. scheme: put entire cities to sleep with a powerful sleeping gas.
Gadget must protect a trainload of important computer parts from M.A.D. hijackers.
A new supercomputer has made the Metro City police so efficient that Chief Quimby fires Gadget but M.A.D. has a plan to control the computer and feed the police false information.