Elmer Rotten, criminal par excellence and, master of disguise has turned himself into none other than yours truly, Lucky Luke. What better way to heist, rip off and bleed the wild west of its last penny?! Suddenly the “real” Lucky Luke becomes the most wanted man in the frontier and he finds himself having to hunt down...himself! Of course Rintindumb, the stupidest dog in the West is utterly convinced that Elmer Rotten is the “real” Lucky Luke! And faithful old pooch that he is, nobody, but nobody is going to lay a paw on his master!