In Fort Weakling, Billy the Kid terrorizes a totally cowardly and raining population. Only a brave and skilled man at the six strokes would be able to put out of state to harm this infamous bandit! Lucky Luke, who was passing by to find work there, will be the man of the situation, assisted in that by Josh Belly, the editor of the city's newspaper, the only intrepid citizen of it. Lucky Luke's plan is simple: to become a bandit more formidable than Billy the Kid, in order to rally the population behind him to chase Billy the Kid... But the latter does not support him, because he is a desperado and not an honest man!