Immortal Man first appeared in "Strange Adventures" (Volume 1), one of the flagship science fiction anthology series of National Comics (now DC Comics) during the Silver Age of Comics. Published in issue #177 in June 1965, the 8-page story "I lived a Hundred Lives" was drawn by Jack Sparling. It is not clear who created him or if Sparling wrote the story as well. The story introduces the hero as a member of an ancient race of prehistoric superhumans who is given a magical amulet by the tribal chief so he may continue fighting evil for eternity by repeatedly reincarnating and recalling his past lives. Immortal Man was brought back to life in "Strange Adventures" #185 (1966) in a 16-page tale, with his reincarnation now explained as materializing in a new, clothed body soon after the death of his previous form. He then appeared again in "Strange Adventures" #190 (1966) and #198 (1967). Jack Sparling drew all four adventures, and Dave Wood wrote at least two of them (#185 and #190). Immortal Man featured on the covers of all four issues of "Strange Adventures" in which he appeared. In these four stories, the amulet also grants him the powers of telekinesis (granting flight and strength), pyrokinesis, and hypnosis.