After the death of the Flash, Superman, Batman, and Wonder Woman launch an assault on the White House and Superman kills President Lex Luthor. Two years later, the Justice Lords now rule over the planet with an iron fist. Lord Batman discovers the dimension which the Justice League inhabits. Considering their counterparts naive, but wishing to spread order to the newly discovered world, the Lords cross over and trap the League. The Lords then take their places in a quest to make this Earth like their own.

An ancient lunar crystal called the Black Heart is discovered. Little do the members of the Justice League know, it harbors an evil snake spirit with the ability to possess its bearer. The crystal's power contaminates almost all of the League, except for the Flash, who manages to prove his mettle and save his friends from the solar eclipse that will destroy both the Sun and the Earth.