Forty years ago, Duke McQueen was the space hero who saved the universe. But then he came back home, got married, had kids, and grew old. Now his children have left and his wife has passed away, leaving him alone with nothing except his memories...until a call comes from a distant world asking him back for his final and greatest adventure.

Duke, Space-Boy, and their rebel friends face off in their final battle against the defining Brotean regime. But there was a traitor in their midst, and their plans are not all they are cracked up to be. It's not just their lives in the balance, but the future of the planet Tantalus. Millar and Parlov'S space epic concludes here!