
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.

Allan Lane
Dave King

Robert Strange
John Kettler

Robert Kellard
Tom Merritt, Jr.
Lita Conway
Linda Merritt

Herbert Rawlinson
Ross King

Harry Cording
Wade Garson

Bryant Washburn
Matt Crandall

Budd Buster
Vinegar Smith

Stanley Andrews
Tom Merritt Sr.

John Davidson
Shelton

John Dilson
Wall

Paul McVey
Zarnoff

Son of Geronimo
Son of Geronimo

Elmo the Fearless
Elmo the Fearless

Elmo, the Mighty
Elmo, the Mighty

Go Get 'Em Hutch
Go Get 'Em Hutch

The Great Barrier
The Great Barrier

The House of Hate
The House of Hate

Fly Away Home
Fly Away Home

Zorro's Fighting Legion
Zorro's Fighting Legion

Daughter of Don Q
Daughter of Don Q

G-men vs. the Black Dragon
G-men vs. the Black Dragon

Man Trackers
Man Trackers

Trailed by Three
Trailed by Three