Leon: The Nine Worlds is a sci-fi/fantasy adventure following Leon, a seemingly ordinary sixteen-year-old living on Terra, a planet tied to eight other neighboring worlds in a shared universe. While Leon leads a normal, chaotic teenage life and initially shows little interest in the cosmos, he possesses an unrecognized connection to the stars and hears a mysterious voice calling his name. When a controlled starship crashes into the mountains near his home, Leon is pulled out of his mundane life