Batman and Superman team up to deal with an alien invasion. A telepathic message leads the duo to a military base where J'onn J'onzz is being held prisoner.
The heroes are captured by the aliens just as their leader, the Imperium, arrives. After vanquishing the invasion, they decide to officially join forces as the Justice League.
Suspecting a railroad job, the League digs deeper into the charges against the Lantern. When the Guardians of the Universe arrive, the Manhunters' true motivation is revealed.
The team encounters an agitated Aquaman while trying to rescue a submarine crew. His opinion of surface dwellers doesn't improve after an attempted assassination by Deadshot.
The team is captured after helping Aquaman stop an underwater coup by his half-brother, Orm. Struggling to free himself and his son from death, Aquaman sacrifices his own hand.
Wonder Woman returns to Paradise Island after her abrupt departure, only to find the Amazons turned to stone. Sorcerer Felix Faust demands three mystical artifacts as the ransom.
While handling an asteroid in space, Superman and J'onn J'onzz are captured and banished to Warworld, a planet where combatants are forced to duel to the death.
Gorilla Grodd uses a mind-control device to obtain isotopes that will help destroy Gorilla City. To that end, he enlists Flash to oppose the Green Lantern.
Central City is under the rule of Grodd, who plans on attacking Gorilla City with missiles. As Flash confronts the maniacal ape the team races to stop the destruction.
With the male heroes suffering from Aresia's bio-weapon, the female Justice Leaguers race to stop their foe before she can contaminate the entire planet.
Still trapped in an alternate dimension, the Leaguers help the Justice Guild wage war against the Injustice Guild. But the secret behind this reality threatens to erase them all.
His illness treated by Ultra-Humanite, Luthor pressures his cadre of super-villains to combat the League. While captured, Batman exploits the greed of the group to his advantage.
Wonder Woman resists the advances of Harv Hickman. The diabolical Le Fays finally obtain the Stone and plan to use it to revert England back to Medieval Times.
Green Lantern's friend is transformed into a monstrous elemental shape-shifter by his jealous employer and is tricked into thinking Green Lantern is responsible.
A confused Mason/Metamorpho is finally convinced the League is there to help him. Together they race to head off the newly transformed Stagg before he kills Mason's fiancé-his own daughter.
Mired in World War II, the Leaguers discover that Vandal Savage has usurped Hitler and is getting technology from his future self, setting the stage for his eventual rule.
