Sheriff Bronco welcomes his pretty young cousin Amanda from Atlanta hoping to find more excitement. Unfortunately one of the things she finds exciting is a young gunman who has his own devious plans for the town's upcoming social event.
Bronco and actor Edwin Booth, brother of President Lincoln's assassin, work undercover by pretending to be hostile to America so as to infiltrate a group that is plotting to overthrow the government at the request of President Grant.
Bronco hires on as a guide to three men and a woman who claim to be starting a business in another town. Actually they are a gang of robbers who have already killed one Pinkerton agent, and are now being pursued by another.
Bronco is assigned to keep the peace between feuding outlaws Butch Cassidy and Billy Doolin as they - and their gangs - visit the town of Painted Rock for the wedding of Cassidy's niece and Doolin's brother but others take advantage.
Bronco and hard-drinking Irishman Terrence Harrigan are fired after the wagon they were guarding is attacked, drivers killed and the gold shipment stolen. Both Harrigan and Bronco decide to fight the gang responsible by infiltrating it.
Bronco finds himself involved in a feud between ranchers Matt Wigram and Jim Gant and the friction between Gant and his son, who is anxious to get out on his own and prove himself independent of his father. Bronco tries to protect the son.
Dr. Miles Gillis is returning home from prison after sending warnings the four men who sent him to prison are going to die. Convicted of treason for treating rebels, he is a friend of Bronco and one of the men threatened - the sheriff.
Bronco wins a 1000 cattle in poker. However, when he tries to bring them to market, he runs into one rancher who charges him outrageous fees for grazing them and another who won't let Bronco cross his property to take the cattle to market.
Bronco, an Army scout, is sent on a secret mission with a young cavalry officer who is bringing back a deserter and the money he stole ten years ago to face punishment. What's more, the deserter is the officer's father.
Deputy Bronco Layne is trailing Marshal Hank Barton who is hoping Valerie Ames will lead him to Mike Bestor, $50,000 and the bandit Rico Cardido who stole it. A stage accident kills the Marshal and Valerie to assume the identity of a nun.
Bronco is working undercover to find a Confederate guerrilla who stole $1,000,000 in gold bullion. His first lead is shot and dies but a clue he left leads Bronco to the guerrilla's home, Bonnetville, and a beautiful dealer.
Bronco is to lead a group of wagons into Mexico with farm implements as a cover for $1,000,000 in gold to support the Mexicans against the French. He has recruited a group of reconstructed rebels for the trip and there are surprises.
Bronco is leading a cattle drive to Abilene, Kansas, a town torn apart by the Civil War. One of his drovers, a young ex-Confederate, gets into continuous trouble over his past, and a woman hopes to use him to get revenge on Marshal Hickok.
Bronco has been hired to protect Prince Philip and his caretaker who have crossed over from Mexico into the U.S.A. A Mexican wants them for revenge in the killing of his brother while others are after them for the $1 million in jewels.
Captain Bronco Layne is given a dishonorable discharge from the U.S. Army, but it's part of a plan to get him into a ring of conspirators who are plotting to assassinate top government officials so they can take it over.
A young woman who claims to be writing an article on western ghost towns hires Bronco as a guide to a ghost town he knows. When they arrive, he finds himself surrounded by men from the town wanting revenge for his work during the war.
Bronco working for the Army Engineers finds himself involved in trying to move one last settler out of a basin that is to be flooded to make a lake. The man and his granddaughter start a worldwide riot when a reporter tells their story.
Bronco leads a group of ex-rebels from Virginia. They are near Fort Bridger and old feelings surface when an Army patrol stops them looking for a deserter suspected of robbing and murdering a sutler in an area known to be unsafe.