When the famous astronauts Chris Godfrey and his team are scheduled for a trip to Saturn, they are at first shocked to learn that they will be put into "deep freeze", a process called hypothermia, in order to make the long voyage possible.

As on another voyage, the telepathic twins are enlisted for the project. Also frozen, they manage to avert disaster by sending warning signals even during their deep sleep.

Extreme danger develops when Saturn's rings exert more gravitation than anticipated - pulling the spaceship into what seems certain destruction...