In this western, three Texas Rangers decide to do their part to save the world and join the Army, but before they can, they are sent to Alaska to destroy a secret Nazi operation involving a submarine refueling station. The outpost is located behind an impenetrable tangle of barbed wire. The rangers get a little help, and discover a traitor. Then to get through the wire, they start a cattle stampede and save the day.

When Rangers Lucky and his brother chase outlaws, the brother is killed. To find the killer Lucky quits the Rangers and robs the bank. This gets him into the outlaw gang where he learns of their next raid. Sneaking out at night he tells his girl friend who must now convince the Sheriff that Lucky is not an outlaw and that he must sent his men out to catch the gang.

Briefly switching gears in 1942 and 1943, western star Charles Starrett made a handful of "northerns" in which he played a Canadian mountie. In Law of the Northwest, Steve King (Starrett) supervises a road-construction project designed to transport war materials to the Aleutians. Problems arise when a crooked contractor decides that his interests are more important than the war effort.

Navy Commander Alan Roberts is assigned to lead an expedition to Little America in Antarctica to investigate reports of a mysterious warm water inland lake discovered a decade earlier. His helicopter and its small party, including reporter Maggie Hathaway, is forced down into a volcanic crater by a fierce storm. They find themselves trapped in a lush tropical environment that has survived from prehistoric times.

Soon after thumbing a ride from a truck driver, Johnny McBride is badly burned and suffers from complete amnesia when the vehicle he’s riding in blows a tire and goes over an embankment in a fiery blaze. McBride later receives a tip from an acquaintance that a photo of him was placed prominently in the window of a photography studio in a town called Lyncastle, so Johnny immediately leaves for the burg in the hopes that something there will jog his memory.