When Sgt. Preston is caught in a snowslide, Yukon King brings help from the nearest cabin. An outlaw named Buck Croyden brings Preston back to his cabin and takes care of him until he recovers two days later. Preston leaves, not knowing the true identity of his rescuer. Later Preston is sent to search for Croyden, who has murdered at least two men, and is part of a gang that has stolen a fortune in gold bullion.; When Bobby Piggot's father dies and leaves him an orphan, he goes with Sgt. Preston to Sulphur City in the Yukon to live with his aunt and uncle. Later, two broke prospectors lure Bobby away from his uncle's trading post in order to rob it. When Bobby realizes their intentions, he breaks away and is shot. The prospectors go to the trading post, but Sgt. Preston has heard the shot and ends up there, too.; Ben Yates takes Jed Norris's daughter hostage in order to force him to take $5,000 for a gold mine that's worth $75,000. Unknown to Yates, Sgt. Preston is escorting the man who is making the $75,000 offer.