Board Thread:The Flash discussions/@comment-24152851-20190130031943/@comment-24152851-20190130105832

Steven Bomb 17 wrote:

Um...ok who's Red Death? A character from DC: Rebirth. He's an alternate universe version of Batman who managed to fuse with The Flash into one person. Except, Batman's mind being stronger completely took control of the body, so he essentially became Speedster Batman. He is one of the many evil alternate universe Batman featured in the "Dark Multiverse" story line.