Earth-Two is a fictional universe appearing in
American comic book stories published by
DC Comics. First appearing in
The Flash #123 (1961), Earth-Two was created to explain how
Silver-Age (
Earth-One) versions of characters such as
the Flash could appear in stories with their
Golden Age counterparts. This Earth-Two continuity includes DC Golden Age heroes, including the
Justice Society of America, whose careers began at the dawn of
World War II, concurrently with their first appearances in comics. Earth-Two, along with the four other surviving Earths of the
DC Multiverse, were merged into one in the 1985 miniseries
Crisis on Infinite Earths. However, following the events of
Infinite Crisis, the Multiverse was reborn, although the subsequent Earth-Two was not the same as its pre-Crisis equivalent.