Caberhi Tram, elite commander of Emperor Shakar's military forces, is a legend in the Ururben galaxy. Even in the service of the evil intergalactic ruler, his adventures across countless worlds have made him a hero to the oppressed. Following his legendary quest to find the three galactic tombs that ultimately spelled the end of the empire, his adventures are told in whispers and tales, in palaces, cantinas, markets, and homes across the galaxy. A series of adventures that are collected in the "Chronicles of Siemb".

One of these adventures took our hero to the domain of one of the empire's governors, beyond Alpha Centauri, where Gremla ruled with an iron fist over five confederations of planets, in the galactic empire of Siemb. Her lieutenant Arkos had turned against the governor and thus against the empire. Caberhi Tram flew to the planet Hypsis, also known as the prison planet, in search of Arkos. Arkos, after destroying Gremla's palace and weakening his government on the planet Sckunn, known to all as the Imperial Palace-Planet, returned to the planet Hypsis, the raw material production center of the empire and the site of ultra-modern defensive installations that Arkos knew perfectly well. Arkos had reprogrammed all the work robots and security terminators for his own protection and, in addition, he counted on the planet's indigenous creatures to defend him. Our hero had to get to the facility, find Arkos and finish him off, but first he had to get through the perimeter and that would not be easy.