在这部神探加吉特2喜剧/动作/家庭片中,邪恶的克劳博士（托尼·马丁 Tony Martin 饰）锒铛入狱，令将他捉拿归案的G神探（弗伦奇·斯图尔特 French Stewart 饰）名声大噪。然而好景不长，G神探发现，随着时间的推移，自己身上的很多机能都发生了故障，因而惹出了一大堆的麻烦，G神探遭到了连连降职。
祸不单行，克劳博士越狱成功，正在酝酿更大的阴谋，想要把整个城市都毁于一旦。为了阻止悲剧的发生，市长设计出了新型机器人G2神探（伊莲·亨德里克斯 Elaine Hendrix 饰），这位精明强干，巾帼不让须眉的机器人小姐很快就抢了G神探的风头。为了维护自己的地位，G神探只得假装和G2神探搞好关系，两人联手追踪着克劳博士的踪迹。
On the outskirts of Riverton, "The Safest City in America", a pensive Inspector Gadget sits in his Gadgetmobile, along with his canine companion, Brain. Gadget is back on the job, on stakeout, but he is concerned that everything is too quiet in Riverton. He has a very simple, rational answer to this; " it's always the most quiet just before criminals strike". Evil must be afoot. In a moment of overzealous crime fighting Gadget arrests an elderly women for wreckless driving, but not without incident. In his effort to make the arrest Gadget's many crime fighting "accessories" go wildly astray. It's time to report back to headquarters for a checkup. Baxter, the "Q" of the Police Department, delivers the prognosis - as he is a prototype things are bound to have some glitches. The remedy is close at hand. But, before Baxter can tell of his new "top secret", Gadget is confronted by a furious Chief Quimby. The little old lady arrested earlier for wreckless driving turns out to be Quimby's mother. Gadget is put on notice - any more mistakes and he is on probation. Meanwhile, in the dead of night, and in a raging storm, something happens that will change Gadget's destiny forever - his arch enemy, his nemesis, Claw makes a daring escape from Riverton Prison. Now, evil really is afoot. Chief Quimby offers Inspector Gadget one last chance to redeem himself through the capture, and return to incarceration, of Claw. And so the chase begins.
