Mxyzptlk, Jr. arrived on Earth and forced Bat-Mite, Jr. to impersonate Batman, Jr. while he impersonated Superman, Jr. as part of his plan to get revenge on Superman. When Batman, Jr. and Superman, Jr. uncovered Mxyzptlk, Jr.'s plan, he was tricked into reading his name backwards and subsequently vanished to his own dimension.
- This version of Mxyzptlk, Jr., 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.
- 1 Appearances of Mxyzptlk, Jr. (Earth-154)
- 1 Images featuring Mxyzptlk, Jr. (Earth-154)
- Quotations by or about Mxyzptlk, Jr. (Earth-154)
- Character Gallery: Mxyzptlk, Jr. (Earth-154)