- Narrator: Wyatt Earp, as Marshal of Wichita, Kansas in 1875, has yet to face the most dangerous threat which can confront a western cow town. Rebellious cowboys need only a leader like Mannen Clements, the deadliest gunfighter on the brawling Chisholm Trail, to become an invading band of outlaws, determined to kill every peace officer and citizen who stands in their way.