Plot
In a brief prologue originally published as a promotional preview to the miniseries, before traveling to Earth's solar system, the Sun-Eater consumes the sun neighboring Starfire's newly-settled planet, New Tamaran. This triggers a supernova which destroys New Tamaran.
An unspecified amount of time later, Dusk arrives on Earth to warn the population that a Sun-Eater is heading towards Earth. Dusk is a member of an unknown alien race and does not speak or understand English, so Saturn Girl uses her telepathic powers to translate and teach her the language.
Despite Dusk's warnings, the Justice League still try to stop the Sun-Eater. For their first attempt, Mister Miracle tries using a boom tube to send it into another dimension. This proves unsuccessful, since the Sun-Eater is not entirely in the main dimension. As a last resort, Superman and several other heroes combine their energies to create a second sun and try to lure the Sun-Eater away from the Sun. The Sun-Eater quickly consumes the second sun before moving on to the main Sun.
As the Sun is extinguished, Earth falls into chaos and the planet starts to freeze. There are only five days to restore the Sun, after which Earth will become uninhabitable. Powerless to do anything to stop the freeze, the League tries to help control the chaos and to keep hope alive. Etrigan the Demon offers the entire world heat at the cost of their souls; the world rejects him, primarily because Etrigan intends to shift Earth into Hell. Lex Luthor teams up with the League to try to reignite the Sun.
Seeing Earth as another failure, Dusk decides that it is time for her to move on. As she prepares for takeoff, she encounters a stranger, and is shocked that he understands her language. The stranger takes Dusk on a quick trip around the world and shows her the League's efforts to keep hope alive. Dusk doubts that there is any hope left for the world. Eventually, the stranger disappears and Dusk is left alone in an alleyway. She is found by a small group of people and, thinking they are going to attack her again, prepares to defend herself. To her surprise, the group offer to take her to a shelter where she will be safe. This act of kindness gives her hope for Earth.
Meanwhile, scientists have realized that the Sun is losing energy, but not mass, to the Sun-Eater. This will cause the Sun to go nova and the explosion will catapult the Sun-Eater into another solar system, where it will consume another sun. The assembled heroes construct a technological means of destroying the Sun-Eater. Lex Luthor angrily bows out of piloting the ship needed, revealing that he was in it simply to save himself. This prompts Superman to volunteer in the hope that his powers will be restored by the solar surge as the Sun is restored. Ferro Lad steals the ship, only to be shunted back to Earth by Hal Jordan, the former Green Lantern then known as Parallax. Parallax sacrifices himself to absorb the Sun-Eater and reignite the Sun. The League watches in astonishment and Dusk says she no longer believes that anything is impossible.
