"Challenge of the Yukon" was a radio drama series that aired from 1938 to 1955 and followed the adventures of Sergeant William Preston of the Royal Canadian Mounted Police and his trusty canine companion, Yukon King. The show was set in the Yukon Territory during the 1890s Gold Rush, and often featured Preston and Yukon King solving crimes and helping those in need.

The show was immensely popular during its run and has been credited with helping to popularize the idea of sled dogs in North America. It was also responsible for introducing the famous catchphrase "On, King! On, you huskies!" which became synonymous with the show and its lead character.

The success of the radio program spawned a television series, "Sergeant Preston of the Yukon", which aired from 1955 to 1958. The TV show starred Richard Simmons as Sergeant Preston and Yukon King as himself and followed a similar format to the radio show. The popularity of the TV series led to a surge in demand for sled dogs as pets, as well as a renewed interest in the history and culture of the Yukon Territory.

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