Half-breed Keoma contributes after service in the Civil War his boundary hometown and finds it under the hands of an raider, Caldwell, and his group of thugs. To make matters even worse, Keoma's three half-brothers and Caldwell have combined forces, and also make it obvious that his yield is an undesirable one. Determined to violate Caldwell along with his brothers' grip on the town, Keoma partners with his dad's former ranch hand into exact revenge.