A weak-willed Italian man becomes a fascist flunky who goes abroad to arrange the assassination of his old teacher, now a political dissident.
In a nameless European city, a local reporter and his doctor wife try to escape from hordes of blood thirsty zombies, undead people exposed to nuclear radioactivity, while the military leaders fight a losing war of attrition against the relentless atomic zombies.
Half-breed Keoma returns to his border hometown after service in the Civil War and finds it under the control of Caldwell, an ex-Confederate raider, and his vicious gang of thugs. To make matters worse, Keoma's three half-brothers have joined forces with Caldwell, and make it painfully clear that his return is an unwelcome one. Determined to break Caldwell and his brothers' grip on the town, Keoma partners with his father's former ranch hand to exact violent revenge.
