As The Dragon Lensman opens, the Boskonian conspiracy seems to have been vanquished with its defeat at the great Battle of Klovia, and the victorious Galactic Patrol is busy re-orienting itself to face the new challenges of policing a galaxy instead of defending it against a ruthless invader. Among those adjusting to the new reality is Second Stage Lensman Worsel, the legendary warrior/scientist famed for his intelligence and dedication to the fight against ignorance and evil. Like all of his species, Worsel resembles the mythological dragons of old Tellus (Earth), with a sinewy, ten-meter-long body covered in scales and boasting great wings and terrifying claws and teeth. But WorselÕs real strength is his mind and its unmatched psychic abilities, concentrated and focused by the Lens shining among his many eye-stalks. And it is the intuition bred of that power that now draws Worsel to the VelantiansÕ incredible archive, the 18-mile-wide artificial moon known as the Planetoid of Knowledge, where he feels certain something important is waiting for him.
He is right -- but what awaits him on POK is more than he bargained for, and before long Worsel and his fellow Lensmen are racing against time to confront a threat that almost no one had thought possible: machines becoming self-aware and battling against organic Civilization, their calcuating computer brains invisible to any kind of psychic detection!
To counter this new menace, the Dragon Lensman finds himself hurtling through space to rendez-vous with the one Lensman who understands robots well enough to strategize against an inorganic uprising -- the mysterious Twenty-Four of Six, whose knowledge of machines turns out to be deeper and more hard-won than even Worsel could guess.
Soon it becomes clear that Civilization will need every bit of that knowledge, and more besides, to face the enemies that are now revealing themselves. For behind the overt power there lurks a vastly more dangerous covert one, and to defeat it Worsel will not only have to challenge the worst fears of his race, but also discover the secret of the young Lensman with whom he must entrust his life -- a secret that will shake the very foundations of the Galactic Patrol!