BYE-BYE, SPY! HERE COME THE MARINES!...What action! Iron-fisted leatherneck mows down sabotage ring...on hurtling cross-country bus! (original poster)

ACTION...at 70 miles per hour! A Marine and his gal friend tangle with saboteurs and time bombs! (original poster)

U. S. MARINE LANDS SABOTAGE RING! 1000 thrills a mile at 100 miles per hour...as an iron-fisted leatherneck battles spies on a speeding cross-country bus! (original poster)

ROARING AT YOU! Thrills galore as lone Marine grabs spies on speeding bus! (original poster)

Trapped! Marine captures spy on speeding bus!