In 1966, the SPADA brothers published his Phantom story Raiders of the Great King Tomb, and he has since drawn a large number of stories for them and for other publishers, featuring The Phantom, Flash Gordon, Rip Kirby, and Secret Agent X-9.
Nicholas Afonsky drew the strip for most of 1938, followed by Austin Briggs until 1940.
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In Kurt Vonnegut's novel Cat's Cradle, the character Franklin Hoenikker was known as Secret Agent X-9 in high school.
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The popular indie rock band, Modest Mouse, released a song entitled and about Secret Agent X-9 on their album Sad Sappy Sucker.
Secret Intelligence Service | Victoria's Secret | free agent | The Secret Garden | United States Secret Service | On Her Majesty's Secret Service (film) | On Her Majesty's Secret Service | Agent Orange | agent | secret society | Secret Service | Talent agent | double agent | Secret Invasion | Secret Warriors | literary agent | Victoria's Secret Fashion Show | The Secret Storm | The Secret Life of the American Teenager | Secret Water | Political Agent | Vatican Secret Archives | Secret of the Rosary | Secret Garden Party | Secret Diary of a Call Girl | My Secret Identity | Free agent | The Secret Millionaire | The Secret Life of Walter Mitty | Secret Wars |
The first 32 issues contained Lee Falk's The Phantom stories, but thereafter, the title alternated between various King Features characters, including Lee Falk's Mandrake, Alex Raymond's Flash Gordon, Rip Kirby and Phil Corrigan, Roy Crane's Buz Sawyer, Allen Saunders' Mike Nomad, Kerry Drake, and Steve Dowling's Garth.
The publisher also has a specialty reprint project going, reproducing old issues of such pulp magazines as The Phantom Detective, Secret Agent X, and The Spider.