Hannibal Heyes and Jed "Kid" Curry, still trying to stay honest until their amnesty comes through, take a job with the Buffalo Bill Wild West show as the Masked Marvels, a trick shot artist and his assistant, to make ends meet.
Things start to go wrong then. A bank in Denver is robbed by two men disguised as them and then the box office at one show is robbed by the same two. They have to catch them and clear their names with their friend, Sheriff Lom Trevors or their chances of being free are gone.
They meet a young Wyatt Earp, Ned Buntline, and Wild Bill Hickok.