The power-mad Warlord stands poised to conquer--or destroy!--the universe itself. Can anyone stand in his way? Enter the Sentinels: College student Lyn Li...brilliant inventor and smart-alec Esro Brachis...beloved hero Ultraa...flamboyant showman Damon Sinclair...and mysterious alien powerhouse Vanadium. When at last they all clash atop the Warlord's floating city, can the world itself survive?