- From the newspaper strip by Charles Flanders owned and copyrighter by King Features Synidcate
- DEATH! DANGER! DESTRUCTION!---JUST HALF AN INCH AWAY! 12 thrill-throbbing chapters of a whirlwind serial that'll leave you breathless! Boats crash, guns blaze, harpoons dart, dynamite explodes---but Secret Agent X-9 fights his way through!
- KILLERS BEWARE! Secret Agent X-9 is on the trail!
- He's here! Catapulted to the screen straight from the exciting newspaper cartoon strip read by millions! New thrills, head-spinning speed, tornado action in 12 smashing serial chapters! (original poster)
- 12 Exciting Chapters Of Thrill-A-Minute Action With Undercover Operators! (print ad - Wellington Leader - Ritz Theatre - Wellington, Texas - Jnuary 16, 1937)
- Gangland Killers BEWARE! This Man Never Misses! Secret Agent X-9 the heroic G-Man who thrilled millions in the famous newspaper strip now battles his way through 12 nerve-tingling chapters on the screen!
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