Hadley "Rip" Jagger was a United States Army sergeant in World War II. While serving in the Pacific Theatre, he rescued the daughter of a Pacific island chief and in return was taught the martial art of judo. Thus he became the Judomaster. At a later point he had a kid sidekick named Tiger.
- This version of Judomaster, including all history and corresponding appearances, was erased from existence following the collapse of the original Multiverse in the 1985–86 Crisis on Infinite Earths limited series. Even though versions of the character may have since appeared, this information does not apply to those versions.
- 18 Appearances of Hadley Jagger (Earth-Four)
- 3 Images featuring Hadley Jagger (Earth-Four)
- Quotations by or about Hadley Jagger (Earth-Four)
- Character Gallery: Hadley Jagger (Earth-Four)