Inks credit from Greg Theakston.
Interview with Joe Simon.
Previously unpublished story possibly intended for Boy Explorers Comics (Harvey, 1946 Series) #2. Text in final frame reads: "If you live to be two thousand years old ... you will never read a more mysterious and startling story than "The Madness of Doctor Altu" with the Vagabond Prince and Roger ... in the next big issue of Boy Explorers Comics!"