Synopsis: skateboard genie California, Venice Beach, Dog Town, rough and dry streets, this is a familiar daily scene for people who lived in it in the 1970s, due to the worst drought in history, all the swimming pools in the park have become dry pools, but it is these dry pools for a group of boys who love to surf (Stacy? Perata, Tony? Alva, Jay? Adams.) Brought inspiration, let the technology of surfing evolve to the wall of the swimming pool, add more safe and reliable polyurethane pulleys to skateboards, and from then on U platform skateboards, an important component of extreme sports, were born. Boys call themselves "Z-Boys". From the huge waves to the abandoned docks to the cement wasteland in the city, their dream of becoming professional surfers has gradually become the dream of professional skateboarders. But the only thing that has not changed is the attitude of contempt for danger and death, the poverty of life sharpens their tough attitude towards survival, and the small polyurethane pulley gradually surges into a wave of free and casual sports aesthetics. Traditional skaters do not know how to understand them, but the girls scream to them without stinginess, developers with a keen sense of smell flock to them.