Earth-31



Earth-31 previously known as Earth-686 was a reality located within the multiverse.

On this Earth, Batman was considerably older than he was on Earth-One, and he had a female sidekick who took on the role of Robin after Jason Todd had died. Her name was Carrie Kelley.

In an alternate timeline created by the conflict of Mr. Mxyzptlk and Bat-Mite, Mr. Mxyzptlk eradicates this universe with his Fifth Dimensional Magic. This timeline was undone however, when their conflict ended, and this universe and all others that they had destroyed popped back into existence.