The
Our Worlds at War storyline involves the heroes battling
Imperiex, a cosmic entity who represents
entropy and threatens to destroy the universe. Thanks to the sacrifice of
Strange Visitor and
General Rock, Earth's forces crack Imperiex's armor, releasing his energy. However,
Brainiac-13 appears with
Warworld and absorbs the energy, vowing to use it to rule everything. In a desperate gambit,
Superman dives into the heart of the Sun, thus gaining a massive power boost. Rapidly realizing that Warworld cannot be destroyed without releasing Imperiex and triggering another
Big Bang, Superman and
Martian Manhunter form a telepathic link with the remaining major combatants — including
Darkseid,
Lex Luthor,
Steel and
Wonder Woman — to explain their new plan.
Tempest focuses energy through Steel's Entropy Aegis armor, which was created from a burned-out Imperiex probe. The Entropy Aegis is combined with Lex Luthor activating a temporal displacement weapon, which sends Warworld, Imperiex, and Brainiac back in time to the beginning of the universe. Before being destroyed, Imperiex realizes that the imperfection he had detected in the universe was himself. Several heroes are killed or presumed dead during the conflict, including
Hippolyta,
Sam Lane,
Massacre, Hippolyta, Aquaman, Sam Lane, and the Kents are later revealed to have survived. ==Characters==