All-Star Comics #56

In the 31st Century, the city of New Modernia faces an unseen threat as the shape-shifting Chameleons infiltrate society with alarming precision. When Professor Ellery warns the Mayor and City Council, he proposes a daring solution: a journey through time to summon the Justice Society from the 20th Century. With the JSA already having encountered one of the Chameleons, they agree to answer the call—setting the stage for a cross-temporal mission that could change everything.

In "The Day the World Ended! Part III," two scientists race against time to bury the planet-destroying Triple-Z Bomb, only to be thwarted by a deceitful General Cadwell—revealed to be a Chameleon in disguise. As G.L. and the Atom pursue the impostor through a battle with guards, Hawkman, Dr. Mid-Nite, and Black Canary arrive at Spaceships, Inc. to find C. F. Tanner in a restricted zone, just as he prepares to flee aboard a Skyblaster—only for plant guards to attack the JSA and let him slip away.

In "The Day the World Ended! Part IV," Knelo's chilling ultimatum echoes across Earth as he threatens total annihilation with the Triple-Z Bomb. Black Canary rallies reluctant officials to resist, knowing the JSA is already countering the Chameleons' deception—disguised as Earth's leaders—before their true identities are revealed and the bomb is neutralized.