In the merged world designated Earth-0 after Crisis, the history of the Star-Spangled Kid is thought to be largely similar to his Earth-Two counterpart, minus whatever interactions he would have had with characters unique to Earth-Two.  After the Crisis, the Justice Society of Earth-0 entered Limbo to held forestall Ragnarok, but the Star-Spangled Kid was prohibited from joining the elder heroes with Dr. Fate declaring that he had a role to play in the heroic future of Earth-0 (Last Days of the Justice Society #1). He continued to lead Infinity Inc., but as he was now in his thirties, adopted the new code-name "Skyman".

In the later 1980's, Infinity Inc. was targeted by the Dummy's iteration of Injustice Unlimited.  The Harlequin, a criminal version who was the daughter of the Manhunter, use illusions to trick Solomon Grundy into believing he was Jade and lured him into attacking Skyman and Mister Bones.  Grundy was then deceived into touching Skyman with the cyanide-secreting hand of Bones, killing him instantly (Infinity Inc. #51).

After his death, his equipment returned to Ted Knight, formerly Starman, who continued his research on it.  Some of the technology was eventually used by Knight's son, Jack, to become the next Starman (Starman #0) After several years, Jack Knight gave up the adventuring life to settle down and with his father dead by the  time, he passed all of the cosmic rod/staff/belt technology to Courtney Whitmore, the step-daughter of Stripsey, original side-kick to the Star-Spangled Kid (Starman #72).  She in turn used it, primarily using the staff, to become the next Star-Spangled Kid and later Stargirl.  Stargirl eventually became a member of  the Justice Society of America when it re-formed in the early 21st century.