Just having finished their apprenticeship as spacemen, Peter and Young Jumbo land on the planet Omega, which is the foremost duty station of the galactic federation.

On an exploratory flight, a police spacecraft discovers a planet on which there might be life; Peter and Young Jumbo must investigate.

During a routine flight, Peter and Young Jumbo land on a planet that's uninhabited; they find a spaceship from Cassiopeia; even stranger, it explodes; they decide to unravel this mystery.

Caught in a magnetic storm during a patrol, the ship piloted by Peter and his friends is severely damaged; they are forced to land on a foreign planet.

Peter and Young Jumbo listen to two corrupt mercenaries who intend to attack and rob a certain planet; they keep on task and try to help the planet.

A message from the planet Leto has informed Omega that the robots are again in rebellion against human beings; Peter is sent to Leto with his friend Metro, but it's a very dangerous mission.