Charles Starrett makes his final appearance as The Durango Kid, this time as Steve Reynolds, a postal inspector who has gone underground to catch the bad guys. His longtime sidekick, Smiley Burnette appears as an itinerant optometrist who is hardly in the plot line of the film. Jock Mahoney plays Jack Mahoney, an eastern educated dude who has come back home. The Durango Kid teaches Jack how to draw and fire a six-gun, and the two ultimately work together to bring the outlaws to justice.
Quick on the Trigger was Charles Starrett's second "Durango Kid" picture for 1949. It all begins when ousted sheriff Steve Warren (Starrett) is put on trial for the murder of heroine Nora Reed's (Helen Parrish) brother. Steve is innocent, of course, but he doesn't stand a chance against prosecuting attorney Garvey Yager (Lyle Talbot) -- especially since Yager is the real killer.
Steve Landry arrives as the new Marshal of a town that is having trouble with outlaws. When an outlaw escapes over the State line out of his jurisdiction, the Durango Kid brings him in. The Durango Kid then continues to break up the outlaw raids. But Belle, the saloon owner who is in cahoots with the outlaws, notices the the boot prints of the Durango Kid match those of the new Marshal and a trap is sent to get Durango.
Dakota Indian Agent Steve Reynolds receives a copy of the Bonanza City Nuggett from Jim Mallory and reads a story blaming the Durango Kid for recent gold mine raids.
Charles Starrett returns as the Durango Kid in Columbia's Rough, Tough, West. For most of the film, however, Starrett is known as "Steve Holden," a former Texas Ranger who comes to a wide-open mining town to visit an old friend (Jack -- later Jock -- Mahoney). Alas, said friend has turned bad, and is busy arranging a major land grab when Steve arrives on the scene. With deep regret, our hero dons his Durango disguise to thwart his ex-friend's criminal activities.
El Puma, a Mexican desert guide, escorts an archaeological expedition headed by Professor Lucius Lloyd through the Indian badlands of Mexico. Marian, the professor's niece accompanies the party as only she can translate the Aztec writings in the diary of her father, murdered on a similar expedition six years previous. The professor is murdered by a knife, and the weapon is recognized as the property of El Puma. Magpie, a Federal Investigator, knows that El Puma is really "Lightnin' Bill' Carson, a former federal agent who has been missing since Marian's father was slain. The reluctant Magpie believes that his old pal is guilty. Carson sets out to prove otherwise.
In Prairie Roundup, Fred F. Sears' direction brings a welcome jolt of vitality to Columbia's aging "Durango Kid" western series. Once again, Charles Starrett stars as Steve Carson, a lawman who is forced to assume the identity of masked do-gooder Durango. Framed for murder, Carson escapes to locate the real killer. It turns out that he was set up by cattle baron Buck Prescott (Frank Fenton), who eliminates competition by stealing livestock from other ranchers.
Using marked bills, Steve is looking for the supposedly dead Henry Hardison. Coming to Bonanza Town he gets a job with the town boss Crag Bozeman and gets paid with marked bills. He suspects Hardison is Boseman's boss and he is right as Hardison and his men are now planning to get rid of both him and the Durango kid.
Western star Charles Starrett was amazing; he kept making the same film over and over, but always made it seem as if it was for the first time. In West of Sonora, Starrett once again plays a frontier good-guy named Steve (Steve Rollins, to be exact), who, when the need arises, disguises himself as The Durango Kid, masked righter of wrongs. This time, Steve/Durango champions the cause of 10-year-old Penelope Clinton (Anita Castle), who has spent her short life as the focus of a feud between her grandfathers, suspected outlaw Black Murphy (Steve Darrell) and Sheriff Jack Clinton (George Cheseboro).
Freight wagons are being stolen and ransomed back to their owners. Government agent Steve Langtry (and his alter ego the Durango Kid) is sent break up the Hood Gang that's behind the robberies.
Silver is being smuggled across the border and the secret passage goes through Betty Long's basement. When Steve arrives he gets tangled up with the rustlers who are now going to have the Durango Kid to contend with.
A major Indian uprising is expected and Wyoming military posts are alerted. Colonel Dennison is meeting with Chief Eagle and his son Running Wolf when Chief Eagle is mysteriously shot. Steve Holden, an agent for the government peace commission, with the aid of a wandering shoemaker, Smiley, discover the troubles and the Chief's murder have been instigated by Cronin, the regimental scout, for personal gain for he and his gang of outlaws.
Old Mike Brady built Brady Town and was a leader, but a bullet from an unknown assailant has ended his life. When the will is read, it leaves the bulk of the property to Kirk, the gambling son of Mike. This upsets Sam, the hard working son, but not gambler Full House who always beats Kirk at cards. But even the Sheriff is suspicious of the will, but he needs proof and the Durango Kid will find the proof.
Stage line owner Brent has his men robbing Halliday stages and when his manager Waring learns of it, Brent has him killed. Jeff Waring arrives and takes his uncle's job. He soon learns what's happening and the Durango Kid goes into action. This keeps Halliday going and gives them a chance to get the mail contract by winning the stagecoach race.
Steve Holden, a secret service agent, is suspended when his boss becomes suspicious of his activities as The Durango Kid. Can Steve prove his innocence?
When Sheriff Jeff Connor of Powder River cannot stop the crime wave, his young son, Larry, writes to the Durango Kid for aid. Taggart, the saloon owner, is the secret head of the outlaws, while Connor's brother Bill is in cahoots with him. Steve Randall, the Durango Kid, and his pal, Smiley Butterbean, arrive in time to stop a stagecoach holdup, and Steve is made a deputy sheriff. Taggart has one of his men, Slade, pose as the Durango Kid and while he is speaking to the townspeople, the rest of the outlaw gang pillages the town, and this somewhat damages the Durango Kid in the eyes of Larry and his sister Doris. Steve suggests that Sheriff Connor visit the government about a railroad project, and Taggart instructs Slade and the gang leader to kill Connor on his trip back.
The cattle herds of some Arizona ranchers are being stampeded and stolen, so the Arizona Stockmen's Syndicate sends ace investigator Steve Reynolds in to find out who is responsible. Steve poses as a vicious gunslinger named Buck McCloud to work his way into the gang, and then becomes the Durango Kid to disrupt the activities he learns about. Jud Temple is the loyal fiancée of town banker Grat Hanlon who turns out to be the brain-trust behind the gang.
Government Agent Steve leases land to Masters so he can bring in horses for the Army. Henley has obtained a forged lease for the same land and Steve is unable to prove it's a fake. While Steve checks with Washington, Henley plans to roundup and ship the horses. Masters also intends to roundup the horses and he has the Durango Kid on his side in the battle with Henley.
When Steve Downey arrives to reopen his brother-in-law's gold mine, he finds a war between the ranchers and the miners. Ashton has had the water poisoned killing cattle. When Ashton's men find Steve's hat, they kill Tom Tavish and frame Steve for the murder. Escaping jail the Durango Kid goes into action.
Arriving to become the new Deputy, Steve Gordon takes over as Sheriff instead when he finds the Sheriff has been killed. He doesn't last long and is fired for incompetence. But he realizes Brady is pulling off a swindle. Having found the proper soil, Brady has salted it with cheap diamonds, gotten Smiley to accidently find them, and is now taking money from eager investors and planning to flee with it.