The Durango Kid, along with assistance from sidekick Smiley Burnett, investigates a pair of murders that threaten to fuel a range war.
Idaho, returning to the area he left as a boy, gets in the middle of a range feud. He takes the side of Endicott. On the other side is Hollister who is unaware that Idaho is his long lost son.
Charles Starrett once more hits the trail as "The Durango Kid" in Columbia's Across the Badlands. By now, the formula was a well-oiled machine: Starrett becomes a lawman, is challenged by the local criminal element, and ultimately goes beyond the law as the masked Durango.
Clay Morgan kills Joel Potter and Marshal Manning has to arrest the brother of the girl he plans to marry.
The Durango Kid is a sort of Robin Hood of the West who helps the lovely Walters (who replaced Starrett's usual love-interest, Iris Meredith), the daughter of a homesteader, defeat the evil MacDonald who has been terrorizing the decent citizens with his gang of rustlers.
The Durango Kid (Charles Starrett) returns to Ret Butte intending to sell his cattle ranch. Saloon owner, Duke Catlett (Lane Chandler) is the secret owner of a sheep flock which graze on the cattle lands--leaving them useless for cattle. A range war looms between the cattlemen and sheepherders.
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.
Cimarron has found a lost treasure and the outlaw gang knows about it. They have made him a prisoner and are trying to get the location from him. However, he has sent for his friend Steve Reynolds and the Durango Kid will soon be on the job.
Steve Driscoll arrives to help a friend who is trying to bring in an oil well. He finds that the well has been blown up and the workers have quit. He gets the workers back on the job and orders a new drill bit . When the drill bit is stolen he organizes the townspeople to invest in the well. But when the money is collected, a fake Durango Kid shows up to take it and flee
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.
Steve arrives looking for the person printing counterfeit bonds. He finds his man in Pop Ryland who has two sons and a stepson. The stepson doesn't want to be an outlaw like the other sons and helps Steve out by posing as the Durango Kid when needed and then leading him to the evidence he is looking for.
Treasury Department Steve Waring, and also, unknown to others, the Durango Kid, comes to Sunset Pass in search of $1000,000 in gold coins, stolen from the government by the late Forrest Brent. He is aided by Smiley Burnette, the local deputy sheriff. Later, Paula Thorpe, Brent's daughter from his first marriage, arrives with her lawyer sweetheart Frank Raeburn, with intentions of proving her father's estate belongs to her and not to Mrs. Brent, his wife of record when he died. The widow Brent has no intentions of giving up one single cent.
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.