Challenge of the Yukon was an American radio adventure series that began on Detroit's WXYZ station. It is an example of a Northern genre story and followed the adventures of Sergeant Preston, a member of the Royal Canadian Mounted Police, and his intelligent and loyal dog, Yukon King, as they maintained law and order in the Yukon during the gold rush era. The series was known for its dramatic storytelling and the iconic call of the wild, 'On, King! On, you huskies!' which became a popular catchphrase. In the episode titled 'The Puppy,' Sergeant Preston and his dog, Yukon King, track two bank robbers who have fled into the wilderness. The story takes a dramatic turn when a young puppy assists in the pursuit. One of the robbers betrays his partner, letting him freeze to death in the harsh Yukon weather. The episode showcases themes of loyalty and justice, typical of the series.