From the United States border to the Arctic ice pack and from the Atlantic to the Pacific, the red coat of the Mountie is the symbol of law and order and a promise that justice will prevail.

To these gallant men, "King of the Royal Mounted" is respectfully dedicated.In World War II, an unnamed enemy require a special mineral, Compound X, discovered in Canada.

Although intended to cure paralysis, the enemy has discovered that it can be used in magnetic mines to destroy the British fleet and blockade America to prevent it assisting the Allies.

The Mounties discover this plot and work to defeat and capture the spies sent to obtain the ore. Sgt King's father is killed in the line of duty, saving his son from death on a circular saw, and leaving him to carry on the fight against the enemy.

Although the interview for the leading man went well, neither Witney nor his partner John English subsequently had a high opinion of Allan Lane as a person or as an actor.