Issue Millennium #1
Subtitle The Arrival (Over)
Date January 1988
Writer(s) Steve Englehart
Artist(s) Joe Staton, Ian Gibson
storyline In Manhattan Beach, the Manhunters met with their grandmaster. They'd infiltrated every aspect of life as normal citizens. Hal Jordan's friend Tom Kalmaku was caught spying on their meeting. He was beaten and left to die on an airport landing strip. Tom was able to get out of the way of a landing jet.
Some of the Green Lanterns were keeping Kilowog company when a Guardian (Herupa Hando Hu) showed up with a Zamaron, Nadia Safir. Herupa told them of the Manhunters.
Harbinger completed some of her historical studies.
The JLI (Justice League International) was called to the GL Citadel. Hal Jordan and his colleagues welcomed them. The Outsiders and Infinity, Inc. arrived soon thereafter. As they all mingled, some of the group noticed strange things about a few of the members. The immortal visitors spoke: the next race of immortals would be born on Earth. They asked Earth's superheroes to protect the chosen ones from the Manhunters.
The Manhunters were created by the Guardians 3.5 million years before. These androids were their first attempt at universal peacekeepers. The Manhunters turned on their masters. The Guardians realized their failure and looked to living beings to be their peacekeepers. The Green Lantern Corps was created.
The Teen Titans were not invited because one of their ten chosen was one of them: Terra. Geo-Force spoke up that his sister was dead. Herupa said he and his companion must regroup. Superman convinced the rest to join up on this mission.
Issue Millennium #2
Subtitle The Summoning (Under)
Date January 1988
Writer(s) Steve Englehart
Artist(s) Joe Staton, Ian Gibson
storyline At the Daily Planet, Lana Lang revealed to Clark Kent that she was a Manhunter.
With one of their chosen dead (Terra) and another senile (Raoul), Herupa Hando Hu and Nadia Safir visited their third, an aborigine in Australia named Betty Clawman. The next, a Japanese man named Takeo Yakata, was not as open to them as was Clawman.
Batman met with Commissioner Gordon, who told him a "Harbinger" was rumored to be the one who'd given secrets to the Manhunters. He then knocked Batman from his window - Gordon was a Manhunter.
Harbinger appeared before the two immortals. She told them she had the ability to split herself into several consciousness and offered to aide them as she did the Monitor during the Crisis. They were aware that her document hand inadvertently landed in the hands of the Manhunters. After hearing this, Harbinger flew away hoping to find a way to rectify her mistake. Heru and Nadia found their next chosen one, a Chinese woman named Xiang Po. Next was a Russian man named Nikolai Latikov.
Blue Beetle, after confronting a man who was attempting to blackmail him, ran into Overthrow.
Heru and Nadia contacted more of their chosen ones, a British woman named Celia Windward; an Iranian named Salima Baranizar; a South African man named Janwillem Kroef; a Peruvian named Gregorio de la Vega. After, they returned to the Green Lanterns of Earth, who were visiting with a recovering Tom Kalmaku - their ninth choice.
Issue Millennium #3
Subtitle The Gathering (Back)
Date January 1988
Writer(s) Steve Englehart
Artist(s) Joe Staton, Ian Gibson
storyline The Manhunters gathered: one of the chosen, Salima Baranizar had fallen - the Blue Beetle was unable to save her from them. Russians killed their representative, Nikolai Latikov.
The Outsiders, reeling from the losses of two of their own (Metamorpho was dead and Dr. Jace was a Manhunter), were in Tokyo to protect Takeo Yakata. Manhunters attacked, but they got Yakata to safety. Infinity, Inc. scooped up Betty Clawman before she was killed by the Manhunters.
A Manhunter disguised as a human broke the Floronic Man out of Arkham Asylum.
Guy Gardner, Batman, and Mr. Miracle went to Celia Windward; they were attacked. Wonder Woman went for Janwillem Kroef; Flash saved Gregorio de la Vega from a suicide attempt. The Green Lanterns went to China to grab Xiang PO
The Manhunters captured Harbinger.
Issue Millennium #4
Subtitle The Choice (Forth)
Date January 1988
Writer(s) Steve Englehart
Artist(s) Joe Staton, Ian Gibson
storyline Infinity, Inc. captured the Floronic Man and brought him to the Green Lantern base; Firestorm and Booster Gold were now on the side of the Manhunters.
Batman found a Manhunter base in Louisiana (where Floronic Man was captured) and headed there. The government sent Captain Atom to Louisiana to capture Firestorm.
The immortals spoke with their eight remaining chosen ones (including Jason Woodrue - Floronic Man), giving them one more opportunity to opt out of their commitment. All stayed on.
The Suicide Squad got their marching orders, also to attack the reported Manhunter base in Louisiana Batman visited looking for Mark Shaw - a former Manhunter - but he was told Shaw had been released (he was actually on the Suicide Squad mission).
A man attacked Madame Xanadu and took from her a Manhunter mask she'd acquired. Jim Corrigan and the Spectre attended her wounds. Spectre felt they needed to go to Louisiana.
Issue Millennium #5
Subtitle The Teaching (In)
Date February 1988
Writer(s) Steve Englehart
Artist(s) Joe Staton, Ian Gibson
storyline While the immortals explained the universe to their chosen, Superman arrived at the GL Citadel to find the other heroes gathered. Batman told him the Manhunter base in Louisiana had been destroyed. Captain Atom had broken the spell on Firestorm and brought him back.
Aquaman and Aqualad arrived - they'd found a Manhunter ship in the ocean. A team was put together to strike the Manhunter home world.
Issue Millennium #6
Subtitle The Dreaming (Out)
Date February 1988
Writer(s) Steve Englehart
Artist(s) Joe Staton, Ian Gibson
storyline The space-faring heroes did battle against the Manhunter Highmaster. Batman and Guy Gardner went after Booster Gold.
Janwillem, a racist, got fed up with the teachings of the immortals and left the group. Floronic Man captured a Manhunter trying to infiltrate them. Batman interrogated him while the others discussed their findings on the ship Aquaman brought them - it wasn't from space, it was from the Earth's core.
Issue Millennium #7
Subtitle The Assault (Down)
Date February 1988
Writer(s) Steve Englehart
Artist(s) Joe Staton, Ian Gibson
storyline After the Manhunter Highmaster was defeated, Dr. Fate admitted to the space-bound team that he could not get them home. He was new (not the original Dr. Fate) and did not yet have the knowledge or power.
The deep sea team reached their destination. They found an underground fortress and overheard the Manhunters' plan: if they were defeated, they would destroy the Earth. The team took out the Manhunters, and during the fight, Booster Gold switched sides again. The heroes refused to believe him when he tried to explain that he'd done everything to infiltrate the Manhunters.
At once, both the space-bound team and the deep sea team were summoned by the immortals (who were now aging rapidly). Their chosen were but one step away from inheriting their roles.
Issue Millennium #8
Subtitle The Ascension (The Rising and Advancing of Ten Spirits)
Date February 1988
Writer(s) Steve Englehart
Artist(s) Joe Staton, Ian Gibson
storyline Xiang was rechristened as Gloss; Takeo became the Ram; Gregorio: Extrano; Betty merged with the Earth and Extrano; Betty: Jet; Floro already was was he was; Tom declined a change - he had a wife and kids to take care of. The immortals, finished with their quest, faded away.
Elsewhere, in his homeland of South Africa, Janwillem set himself up as a villain.

Notes, references to time, and chronology:
Guy Gardner is still on his best behavior, a result of being knocked out by Batman.
Batman is aware of the Crisis, saying "She (Harbinger) was involved in -- in a case I had a hand in!" (issue 2)
A year has passed since the Legends series: "Now I, no less than you, was fooled about our heroes by G. Gordon Godfrey last year..." (the President in issue 3)
 

This series crosses over into several other titles: