JLA #1~Them!
The President calls Superman to investigate a giant spaceship at the White House when eight beings step out and introduce themselves as the Hyperclan.  Their leader, Protex, explains how millions of years ago, their home planet was destroyed by its inhabitants, leaving the superhuman survivors to roam the galaxy.  He states that they would not let the same happen to Earth and the next day they turn the Sahara Desert into lush gardens.  As Superman goes public with his idea that changing the environment so drastically could prove more harm than good, the public begins to question why other superheroes had never made the contributions the Hyperclan did.  Next, the Hyperclan brutally kills several superhuman villains, dropping the national crime rate 60% in a day.  Meanwhile, Green Lantern and Wonder Woman are helping the past team move out of the JLA Satellite when the structure is attacked.  Metamorpho sacrifices himself to safely return Ice Maiden, Nuklon, and Obsidian to Earth while the other two fight the attackers off.  However, the satellite explodes and GL and Wonder Woman return to Earth to meet with the other Leaguers (minus Aquaman who neglects to respond).  Batman proposes the idea of mind control and that the Hyperclan is part of a planned invasion of Earth.  He suggests they make plans, move fast, and hit hard.

JLA #2~The Day the Earth Stood Still
As the Hyperclan establishes three bases--in the Pacific, the Gobi Desert, and the Antarctic Martian city of Z'onn Z'orr, Superman and Green Lantern discover the spaceship over the White House is only a projection, but fail to find any orbital mind control transmitters.  Martian Manhunter decides it's best for the team to split up and attack each of the three new bases and destroy their transmitting facilities.  Wonder Woman checks the Pacific base where she meets Aquaman, and they are confronted by Fluxus--the Hyperclan's shapeshifter--and Tronix--one of the Hyperclan's two females.  They state to the Leaguers that Earth will belong to the Hyperclan and manage to defeat both Wonder Woman and Aquaman.  Meanwhile in the Gobi, Green Lantern and Flash are attacked by the speedster Zum, the giant robot Armek, and the soldier Zenturion, who also overthrow their Leaguers.  Elsewhere, J'onn is secretly meeting with Protex who offers the Martian membership with the Hyperclan.  Batman and Superman meet similar fates as the others when they're attacked by Primaid and the ghostly A-Mortal at Z'onn Z'orr.  A-Mortal crashes the Batplane, though neglects to check the flaming wreckage.  Protex claims victory as he pulls some Kryptonite on the last remaining Leaguer, telling Superman the world will soon be on its knees.

JLA #3~War of the Worlds
Knowing the Hyperclan thinks he's dead, Batman sneaks into the Z'onn Z'orr base and disables some monitor robots.  Racing around the world, Flash thinks up a quick plan that takes out Zum.  Still in the Gobi, Green Lantern is about to meet his doom when Zenturion and Armek make the mistake of thinking Kyle's ring has the yellow impurity.  He uses that time to his advantage and takes them down with Flash's help.  Together they enter the Gobi base and find news reports of Superman being captured by the Hyperclan for attempting to kill Protex.  He's to be publicly executed!  Just then Armek and Zenturion come to and reveal to the Leaguers that Martian Manhunter has betrayed them.  Back in Antarctica, the four unconscious JLA members are placed into a torture device called the Flower of Wrath as Superman watches on.  A-Mortal becomes suspicious at the loss of monitor reports and is defeated by Batman when he decides to check them out.  After some time, Tronix, Zenturion, and Fluxus go to see what's taking A-Mortal so long to return.  They unknowingly walk into a room ringed with gasoline as Batman reveals he knows their secret--the Hyperclan are actually Martians.  They have all the powers J'onn does and they wouldn't check the Batplane's wreckage because of the flames.  He sets the room on fire, taking down three more of the Hyperclan.  Elsewhere, Protex panics and calls his backup--70 more Martians who have been waiting just outside "real space"--to attack Earth.

JLA #4~Invaders from Mars
As alarms all over the world signal warning of the invasion, Superman realizes something--he can hear them.  Why hasn't the Kryptonite killed me yet, he wonders.  Then he realizes there is no Kryptonite; it's just more mind control.  Finally making the connection himself that the Hyperclan are Martians, Superman breaks free of his shackles and engages Protex in battle.  As Primaid tells Armek to activate the Flower of Wrath, "Armek" reveals he's actually Martian Manhunter and the real Armek is still in the Gobi Desert.  Protex and Primaid both return to their natural forms; Protex surrounds Superman and the two dive toward the center of the Earth while Primaid takes her battle with J'onn outside.  Just as Zum and Armek reach Z'onn Z'orr, Aquaman, Wonder Woman, Flash, and Green Lantern break free of the Flower.  Flash and GL finish Armek with fire, Aquaman uses his mind to give Zum seizures, and Wonder Woman wrestles Primaid to her end.  Meanwhile, Protex spins the tale of his Pale Martian race and their banishment to the "Still Zone" as he attempts to defeat Superman.  Superman of course wins, though, just as Batman comes in dragging the four he defeated earlier.  The team then uses the Hyperclan's equipment and Superman broadcasts to the world that the Martians can be stopped with fire.  The invasion is stopped and the world is saved.  The Sahara decays, unable to support the life the Hyperclan put there, and Martian Manhunter is put in charge of the Pale Martians' judgement.  Remnants of the destroyed JLA Satellite are used as the building foundations for the new JLA Watchtower, placed on the Moon as Earth's first line of defense.

JLA #5~Woman of Tomorrow
Superman, in his new electric energy form, attends the small funeral for Metamorpho then heads to the Watchtower to begin interviewing potential new members for the team.  Following remarks that the JLA is a group only for the elite, the team decided to up its permanent roster to twelve members.  After what seems to be all the applicants leave, one new face enters the Watchtower--Tomorrow Woman.  Welcomed as the first official new Leaguer, Tomorrow Woman joins the team in battling IF, an element of pure destruction that no one can seem to understand.  What the League doesn't know, however, is that their newest member is actually an artificial intelligence created by the joint effort of Professor Ivo and T. O. Morrow.  The android has been programmed to infiltrate and destroy the JLA as her two creators look on.  When Batman finally discovers that IF is a dangerous weapon from the future accidentally gone wild, Tomorrow Woman becomes the only person able to stop it.  Ivo and Morrow are awaiting the electromagnetic pulse their creation will release, destroying the League.  However, Tomorrow Woman senses she's "a bad person deep inside somewhere" and sacrifices herself to disable IF.  One more surprise comes out, though, when Morrow reveals to Ivo that he suspected Tomorrow Woman would turn good and created her just to prove he could create a better artificial intelligence.  The two are captured by the League, and everything ends just as it began, with Superman attending Tomorrow Woman's funeral.