The Cat was acting as an abusive kendo instructor at the Heart Mountain War Relocation Center in Wyoming and was a suspected Imperial Japanese spy. After Rip Jagger challenged him to a duel and defeated him one of his superiors claimed that the Cat was actually a Nazi spy, but the character was later seen in Japan. One of his young students went on to become Tiger, Judomaster's sidekick.
- Martial Arts: An experienced Kendo practitioner. 
- Enemy of Judomaster
- This version of Cat, 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.
- The Heart Mountain War Relocation Center in Wyoming was a real life concentration camp in which Japanese Americans were interred during the second world war. Like all the others there were no reports of Imperial or Nazi spies or sympathizers at the site and many of the men interred there fought and died for the United States during the war.
- 2 Appearances of Cat (Earth-Four)
- 1 Images featuring Cat (Earth-Four)
- Quotations by or about Cat (Earth-Four)
- Character Gallery: Cat (Earth-Four)