These are the first stories of humanities fight against the life destroying Berserker machines. Programmed to destroy all life, the Berserkers threaten the very universe. Only one form of life, humanity, is uniquely qualified to take on the machines.

Meet Berserker hunter extraordinaire Johann Karlsen and his evil brother Felipe Nogara and other gallant fighters of the killer machines.

Not satisfied with efforts to destroy all life in present time, the Berserkers devise a way to penetrate human history. The death dealing machines pinpoint key personalities in human history for destruction. When and if they succeed human progress is set back perhaps thousands of years. Humanity has an answer. On the planet Sirgol, the only planet in the galaxy where time travel is possible, an elite corps of Berserker hunters struggle to derail the Berserkers' efforts. Lieutenant Derron Odegard of Time Ops faces death dealing, time-traveling Berserkers in three exciting adventures: Stone Man, Winged Helmet, and Brother Berserker.

A collection of fifteen of Saberhagen's Berserker short stories previously published as Berserker and Berserker Brother Assassin plus and introductory essay by Saberhagen "Berserkers for Fun and Profit: