Detritus is a planet surrounded by dense layers of space debris. Decades ago, a human fleet crashed on it. The descendants of the survivors fight for survival against the alien Krell fighters. Since childhood, young Spence has dreamed of becoming a pilot and proving to everyone that her father was not a coward who ran away from the decisive battle. But first you need to enroll in a flight school and stay there until graduation, which only the best can do.