Everyone knows Joe, Jack, William and Averell Dalton, the four dumbest desperadoes in the Old West and the worst enemies of Lucky Luke's holidays. But before them, Luke had also encountered their cousins: real-life legends of the West Bob, Grat, Bill and Emmett. When these four began making too much trouble, Luke was called to get rid of them. Fortunately for him, they weren't much brighter than their successors... but they did provide plenty of entertainment!