Another father and son team of scientific superiority, sally to Saturn- to prove their innocence and even an old score with a greedy gang who want to blow up the moon for the minerals therein. The secret of Saturn's rings, finds Dr. Rhodes, ousted head of the Terraluna mining operations, is that they were once moons which, blown apart, formed rings just as our own moon would do under the pressure if atomic bombing were used to extract the uranium at its center. The concurrent excitement is commensurate with the plot.