Set on the Mexican border in 1850, Bad Men of the Border was the first of seven Universal Westerns starring handsome Kirby Grant, a former singer from Montana who had earlier acted under the name Robert Stanton. The series, Universal's last attempt at competing with Republic Pictures' many streamlined B-Westerns, also featured the bucolic Fuzzy Knight as Grant's sidekick. Grant and Knight are undercover U.S. marshals tracking down a gang of counterfeiters. To their surprise, they are soon assisted by a beautiful Mexican dancehall performer, Dolores Mendoza (Armida), who proves to be an undercover agent as well, in her case for the Mexican rurales headed by Captain Garcia (Francis McDonald).

Two championship rodeo partners travel to New York to find their missing friend, Nacho Salazar who went missing there.

A man who's a dead ringer for the leader of an outlaw gang kills the gang leader, then takes his place to try to bring the gang to justice.

An outlaw calling himself Passin' Through halts his "evil" ways long enough to help out some children in difficulty.

A young Mormon couple is attacked by a bunch of outlaws. They kill the man and the woman is raped several times and left for dead in the desert. With the last ounce of her strength she gets to the hut of an old hermit who nurses her back to health and teaches her how to shoot. The woman then frees three female criminals and seeks vengeance on the outlaws.

A rancher vows revenge on the five men responsible for his father's death.

Imprisoned for a murder he did not commit, John Brant escapes and ends up out west where, after giving the local lawmen the slip, he joins up with an outlaw gang. Brant finds out that 'Jones', one of the outlaws he has become friends with, committed the murder that Brant was sent up for, but has no knowledge that anyone was ever put in jail for his crime. Willing to forgive and forget, Brant doesn't realize that 'Jones' has not only fallen for the same pretty shopgirl Brant has, but begins to suspect that Brant is not truly an outlaw.

Danny, a greenhorn from New York comes to the Mexican border in search for his older brother whom he has always looked up to. A Texas Ranger charged with bringing in, El Tigre and his gang of bandits, takes Danny under his wing.

Roy Rogers is a cowboy who joins the Border Patrol, only to have his buddy Tommy get killed at a local saloon. Determined to get revenge at any cost, Roy and Rusty cross the border in search of Arizona Jack, the man responsible for Tommy's death.

Valentine Casey is a Marshal in the desolate Tucson territory of the early 1900s. On Christmas Eve, his outlaw family pays him a disturbing visit. He must confront the sins of his past. He and his partner, U.S. Christmas, journey through the desert to a small town that the ruthless Henry Clan has hit in order to save Casey's love, Adelyne.

A US marshal goes undercover to bust up a bunch of rustlers.

A former sheriff relentlessly pursuing the 7 men who murdered his wife in Arizona crosses paths with a couple heading to California.