CBR

All-Star Superman's greatest mystery is the true identity of Dr. Leo Quintum. 1 / 8

Quintum is a scientist who was inspired by Superman to create new innovations for humanity. 2 / 8

The scientist explored new worlds like The Bizzaro-verse... 3 / 8

And he also helped Superman restore Kandor to its proper size, placing its people on Mars. 4 / 8

Many theorize that Quintum is really Lex Luthor from the future, after gaining Superman's powers. 5 / 8

Luthor and Quintum both share genius intellect and a strong resolve to achieve... 6 / 8

Yet Quintum focuses his time on bettering humanity because of Superman, rather than hating Superman. 7 / 8

Superman's impact could be so great that he made Luthor into a better man. 8 / 8