The Mysterious Traveler was an anthology radio series, a magazine, and a comic book. All three featured stories which ran the gamut from fantasy and science fiction to straight crime dramas of mystery and suspense.
Tales of the Mysterious Traveler #7 (March 1958)
Front cover of the November 1951 issue
Luis van Rooten on The Mysterious Traveler
Robert Arthur Jr. was a writer and editor of crime fiction and speculative fiction known for his work with The Mysterious Traveler radio series and for writing The Three Investigators, a series of young adult novels.
Robert Arthur Jr. at work during 1950.
Arthur's novelette "The Mirror of Cagliostro " was the cover story for the June 1963 issue of Fantastic Stories, illustrated by Lee Brown Coye
Arthur as pictured in Wonder Stories in 1931