The bloody war between the human and krait races is over, but Captain Greg receives a new secret mission. On the outskirts of the Galaxy, on the planet Kallordang, a strange rock is discovered. Greg manages to establish that it is in fact a giant ship-city created by the mysterious civilization of the Saiyans. Once upon a time, the Saiens revealed the secret of hypertransition to people and kraits, provoking an armed conflict. And now they want to return their ship, filled to the brim with super technologies. But this will not be so easy, because Captain Greg has his own scores to settle with powerful aliens.