In the 1870s, Marshal Wyatt Earp (Bruce Cowling) calls upon Dodge City, Kan., Sheriff Bat Masterson (George Montgomery) to track down rancher Merrick (John Maxwell), who is accused of murder. But, thanks to some proof held by local Native American Chief Yellow Hawk (Jay Silverheels), Masterson realizes Merrick might be the victim of a frame-up. So, with the help of Earp and gunfighter Doc Holliday (James Griffith), Masterson sets out to find those who are really behind the killing.