Lieutenant Bäse has arrived on Marvon V, a planet that has been attacked by bugs. He was summoned to Fort Walter-1 to launch a counterattack against the bugs. According to the secret service, there is a brain bug nearby, which must be captured at all costs...

After successfully capturing the Brainbug, Lieutenant Bäse was taken to Walter-2 Base, where it is now awaiting transport to Earth. On the planet Marvon V, there have been increasing reports that a sect called "Cheta" has formed, who believe that the Bug i...

After the successful escape from the brainbug, the base Walter-2 is no longer safe and has to be evacuated. The Brainbug knows the base and will try to kill everyone in there at all costs. Major Marques was convicted of his negligence and taken to Guantana...