In this remake of Johnny Dark (1954) an ex-GI and college dropout would rather play with cars than anything else until he meets the lovely Eady with whom he falls passionately in love. They get engaged and go to San Francisco where he begins working on building a prototype car for a millionaire. When the arrogant young man ignores the millionaire's advice and destroys the car, he is immediately fired. The young man, determined to make his engine work, manages to scare up enough cash to get his engine back from the millionaire. He then goes on to enter the Tri-State Endurance Race. After it is all over, the young fellow finds that he has become a serious young man. He then marries his girl, and goes back to college.