"Mister Square" was one of four teenagers who needed the Phantom Stranger to help them solve the mysteries.
- This version of Mister Square, 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.
- 6 Appearances of Mister Square (Earth-One)
- 1 Images featuring Mister Square (Earth-One)
- 1 Quotations by or about Mister Square (Earth-One)
- Character Gallery: Mister Square (Earth-One)