Alexander Luthor of Earth-3

The first and only known superhero of the parallel world known as Earth-3.

Alexander Luthor teamed up with Superman and Superman of Earth-2 to defeat the dreaded team of Lex Luthor, Alexei Luthor of Earth-2, and Ultraman of Earth-3 (DCCPA No. 1, 1982: "Crisis on Three Earths!").

Note: Alexander Luthor had one son with his wife, the Lois Lane of Earth-3. They named the child Alexander Luthor, Jr., and he later became a superhero as well, wearing a golden suit of armor during his very brief career.