Synopsis by Hal Erickson
As the opening credits flash across the screen, Jerry is seen mixing several colorful chemicals with test tubes and beakers. He concocts a greenish potion which, when swallowed, transforms Jerry into the fastest mouse in all cartoondom. Before long, Jerry is whizzing past Tom at hypersonic speed, grabbing the cat's precious cache of sardines before making his way to the kitchen. Unable to see the mysterious food-snatcher, Tom sets up a movie camera to catch the mysterious food-snatcher in the act, hits the slo-mo button on the projector and finally figures things out. The trick now is to capture Jerry before he "attacks" again--a hard and painful task indeed.