An old man who tells tall tales of courageous exploits to his grandson is humiliated when he is robbed of his gold at gunpoint in front of the boy. He helps Sergeant Preston capture the robbers to win back the boy's faith in him.

A man who grew up in Georgia during the U.S. Civil War suffers a knock on the head during a robbery, causing him to think he is back home during Sherman's devastating march through the state.

Two bank robbers arrive in Hudson Bay and lay low. Sergeant Preston and Yukon King go to Hudson Bay on an unofficial tip to find the robbers.

Sergeant Preston and King are in Skagway, Alaska to deliver mail to an outpost set up for mounties. Though he lacks official jurisdiction, he is helping clean up the town of lawlessness, and is helped by a tenderfoot from Texas, after helping the man avoid being conned.

Sergeant Preston once again infiltrates a counterfeiting gang, one he also suspects of murder. One of the members is an enormously strong but simple-minded man. Old Faithful, the murder victim's lead dog, joins the sled team.

An explorer who fakes a claim of finding a sea passage to the North Pole uses sabotage and trickery involving small skull stones to keep from being exposed as a fraud. He is willing to commit murder if necessary.

A man who along with his wife wants to move back to the United States is targeted for murder so the would-be killers can take his mine. Sergeant Preston and King help fool the would-be killers into thinking the man is dead in order to trap them.

Sergeant Preston is on the hunt for an escaped killer whom Preston helped put behind bars. The killer mercilessly gunned down another mountie and friend of Preston's, and is out to kill Preston.

A trigger-happy old man's imaginings of people trying to rob his gold mine turn out to be right.

Miners are being terrorized by three robbers clad in black, led by a well-liked woman.

A fur smuggler is coercing a woman, whose father has a weak heart and could die at any sign of excitement, into supplying him with furs to smuggle across the border.

A family man whose son needs an operation is accused of stealing gold that he was safeguarding. An aging malamute aids in the pursuit of the real thieves.

Two gold robbers firing shots from a ridge have Sergeant Preston pinned down in a cabin with two other men, one of whom is a washed up doctor paralyzed by fear.

Two ex-convicts try to blackmail a former cellmate into giving them the money out of the safe at his trading post. Sergeant Preston and King get help from a St. Bernard.

Two murderers escape jail and steal Sergeant Preston's sled team. Burdened with an inferior team, he sends King out to find his own team and lead it, along with the killers, back to him.

A young man tells the news papers where is gold strike is and now claim jumpers are out to get it.

Sergeant Preston is on the trail of fur thieves. He gets help from a reclusive oaf named Grizzly.

Sergeant Preston must find the man who attacked a prospector and attempted to steal his diamond necklace before the would-be thief tries again.

Two hold-up men - one wounded - force their company on an old ex-convict friend who is now going straight. They threaten to reveal his past to his young daughter unless he helps them by getting medical aid.

After critically wounding a young mountie, three outlaws steal his gear and supplies, including his uniform, allowing one of the criminals to pass himself off as a mountie.

A man comes to the Yukon from England to have his young cousin, a boy, killed for the boy's estate, and is aided by three outlaws.

A man is murdered and his dog is the only witness.