The Dragon Lensman

"They're legendary star warriors whose fabulous exploits have made them elite guardians of the galactic empire. Their most potent weapon is the mysterious force of the crystal embedded in their flesh -- a force that binds alien adventurers from every corner of existence to the cosmic brotherhood of the lens. The entire planet was an awesome time-bomb set to explode at the slightest provocation. Worsel's first blunder was merely lethal. His next promised to be positively catastrophic!"--Back cover.