A Swill of Gunpowder (15 min.)
Preston chases down a gang that cleaned out the bank in Prospect City, but they manage to get the drop on him.
Blind Man's Bluff
Preston comes across a snow blinded prospector who had come from a snowed-in mining camp which was dangerously low on supplies.
The Bonanza Belle (15 min.)
The owner of a freight company is unhappy that White Horse is now getting steamer service. So he plans to discourage the competition by planting explosives in the engine room.
Caught by a Button (15 min.)
Preston finds a prospector murdered in his cabin, which shows evidence of a great struggle. The trail he follows turns out to be not much help when it mixes with the tracks of others heading to town.
The Dachshund (15 min.)
A German prospector is robbed by two locals when word gets out about how much he's been pulling out of his claim.
Dynamite Provides (15 min.)
A settler stumbles upon the hideout of a gang of fur smugglers and gets trapped in there by a cave-in.
The Epidemic (15 min.)
Preston comes across a village in the middle of an epidemic. But his plan to go to Dawson City for a supply of serum is cut short when he gets the disease himself.
Eskimo Justice (15 min.)
Preston goes out in the wilderness to investigate the murder of an explorer who it was believed was killed by an Eskimo from a tribe hostile to white men.
Father Donovan (15 min.)
A priest heading to Dawson City to collect $30,000 willed by a local to be used to build a mission in the area gets waylaid by outlaws, one of whom switches clothes with him so as to get the money.
Flash (15 min.)
Young Billy and his dad surprise a sinister, scarred half-breed in the act of beating a young puppy. The cruel brute flees, for he has been robbing traps of the likeable Pierre. Billy adopts the pup, who grows very loyal to his young master, but always remembers the man who mistreated him in his puppyhood.
The Ghost Riders
A boomtown is being harassed by a gang of robbers disguised in white robes and hoods. Sergeant Preston is sent to investigate the matter.
Note: This should not be confused with The Lone Ranger episode with the same title (to which it only bears scant resemblance).
The Grave Robbers (15 min.)
While digging a grave for a prospector, two men come across a rich gold vein. When the widow declines to sell the land, they plan to extract the ore while she’s gone to White Horse to pick up her grandson.
Grizzly Martin (15 min.)
Red and his half-breed sidekick, Chico, steal the dog Blackie, sole companion of the hulking Grizzly Martin. a mentally challenged loner. The thieves tell Grizzly that Preston has taken his dog, directing him to Preston's home, in the hopes that the maddened half-wit giant will eliminate the Mounty. King's defensive loyalty to the sergeant, and Grizzly's love for dogs, eventually make the two men allies in tracking the evil-doers, and in seeking the return of Grizzly's missing pet.
In Self Defense (15 min.)
A gambler harasses a doctor he blames with dubious cause for the death of his wife, making it so that he can’t set up a practice for long and even trails him to the Yukon.
The Irish Wolfhound (15 min.)
An Irishman comes to the Yukon with his wife and pureblood wolfhound to work the isolated claim he inherited from his grandfather and, due to his inexperience, runs into trouble.
The Last Laugh (15 min.)
The shrewish wife of a recently deceased prospector heads up north to claim his fortune and gets targeted by the less savory elements of the locality.
Long Fall Canyon (15 min.)
While Preston is taking in an outlaw he had captured, the ground beneath them collapses and they find themselves stuck on a precarious ledge.
The Lost Indian Mine
A trio of claim jumpers discover that a widow's son is coming to the Yukon to work his father's mine. They figure if he meets with an "unfortunate accident", his mom will sell it cheap. And they're not going to let the fact that Sergeant Preston is in the area worry them.
The Mail Team (15 min.)
Two outlaws rob a general store of the gold and furs contained within and commandeer the dog team of a mail sled to effect their escape.
Ned's Wife (15 min.)
A prospector who has recently struck it rich responds to an ad for a mail order bride, unaware of her true intentions.
New Year's Eve (15 min.)
King is left to guard the general store safe while the citizens of Forty Mile enjoy the New Year's celebrations. But a particularly determined safecracker uses some firecrackers to distract him.
Outlaw Dog (15 min.)
A luckless prospector loses his dog in a game of poker in an attempt to win back his claim. The new owner then trains it to steal.
Preston Turns the Tables
A doctor has been swindled into buying a salted gold mine. Preston comes up with an idea on how he can get his money back from the con men.
See also Random Notes (Frontier Gentleman).
Queen's Parlor
Preston's only clue to the reason behind a man's murder comes from a cryptic letter the victim was carrying.
Rex (15 min.)
The dog of a prospector manages to lead Preston to his master, who has been shot and left for dead by claim jumpers.
Scorpion Sam's Gold (15 min.)
A trading post owner is feeling guilty about taking the gold of a miserly prospector who died when his cabin caught fire some time back. So he asks Preston to help him locate the next-of-kin so he can recompense them.
The Sergeant's Present
A mining company clerk has embezzled funds to pay for medicine for his sick daughter. Even though he intended to pay it back, his miserly boss demands that Preston arrest him.
The Silver Fox (15 min.)
Jim traps an unusual vixen fox, which Sergeant Preston astutely recognizes as a rare and valuable Silver Fox. Jim's father, Ned, has a loan for which his gold claim is collateral, and pledges the fox as additional guarantee in return for an extension on his loan from the crafty and devious Jake, who has inside information that there is a big vein of paydirt trending toward the old man's acreage. Jake then conspires to capture or kill the fox, so that the claim will be his.
The Trail (15 min.)
Two gunmen kill the Mountie who was pursuing them and one of them poses as him so that they can more easily slip out of the country.