The Canadians have discovered a valuable substance called Compound X, which can cure infantile paralysis. When a country at war with Canada learns that Compound X also contains magnetic properties that could aid them in their warfare against the British, they send agents to infiltrate Canada and steal a large quantity of the substance. It's up to Sgt. King (Allan Lane) and his Mounties to track down the agents and put an end to their scheme.

Directed by: John English & William Witney
Written by: Franklin Adreon & Joseph F. Poland & Sol Shor & Norman S. Hall & Barney A. Sarecky
Runtime: 211 minutes
Tagline: THE KING OF YOUR FAVORITE CARTOON STRIPS BECOMES THE ADVENTURE KING OF THE SCREEN!
Cast:
Allan Lane Allan Lane
Dave King 
Robert Strange Robert Strange
John Kettler 
Robert Kellard Robert Kellard
Tom Merritt, Jr. 
Lita Conway Lita Conway
Linda Merritt 
Herbert Rawlinson Herbert Rawlinson
Ross King 
Harry Cording Harry Cording
Wade Garson