...this one is a bit special, as these tales had not been collected in a tradepaperback for individual release (unlike all the other team-ups before).
A sad state of affairs, as the Crises faced by the teams got personal, and involved....then the red skies came!
Crisis In The Thunderbolt Dimensiontheir first meeting), with Jay wondering why his Earth was called Earth-2, when super-heroes started their first.
As the two headed towards a JLA transporter tube, their musings were cut short when they were attacked by Johnny Thunder's Thunderbolt! While Jay was simply startled by the attack, Barry was put into a coma, which put some worry into Jay's need to see the Justice League.
JLA-JSA team-up), and Dinah responds, taking her through how she then went to Earth-1 and joined the JLA. Red Tornado interrupts, telling of how all the other current JLAers, like Superman, Wonder Woman and the rest were also either comatose or unreachable.
Power Girl finds the Crime Champions (villains from the two Earths) out attacking various mystical sites on Earth-1, and the heroes split into teams to chase them down, with Starman and Black Canary staying on the satellite. Starman convinces Black Canary they must go to the Thunderbolt dimension to track down this errant Thunderbolt (and find out what happened to Johnny Thunder). In the Thunderbolt dimension, they find the Thunderbolt, who takes them captive for the Johnny Thunder of Earth-1 (the evil doppelganger of the JSA's heroic Johnny Thunder, first faced in an early JLA/JSA team-up), as well as the preserved corpses of.....Larry Lance and Black Canary!
The Doppelganger Gambit
The JSA Johnny Thunder finally frees his mouth, and say, you'd see how fast he got free and knocked out the Earth-1 Johnny Thunder, and had the T-Bolt revive the JLA to go help with the Crime Champions (Elongated Man and Flash with Chronos and Fiddler; Firestorm and Green Lantern with Dr. Alchemy II and Icicle, and Zatanna with Felix Faust and the Wizard.
his last solo team up with Barry Allen and a multidimensional battle in Wonder Woman, Hourman and the Thunderbolt after the JLA and JSA faced the Secret Society of Super-Villains, Starman after the JLA, JSA and All-Star Squadron fought (and forgot) Per Degaton, Power Girl when the JSA briefly met Captain Carrot and his Amazing Zoo Crew, while Huntress had been in her solo series in the back of Wonder Woman's title. The JSAers next appeared in Infinity, Inc. #1, except for Huntress (back to her Wonder Woman back-up slot) and the Spectre (who last appeared in the second to last Brave and the Bold with Batman, and next in the second Swamp Thing Annual).
Oddly, the last issues adventure was summed up by the Monitor (an incredibly powered being watching over the Earth and more, as he was preparing with Lyla for the Crisis On Infinite Earths).
As the heroes reunited, the Commander put his plan into action (as he had possessed Dr. Champion).
While the heroes were battling, Victoria, displaying more powers beyond dimension hopping, battled the Commander, and was able to drive him from her father's mind.
Earth-3's Crime Syndicate of America floating in limbo (in the prison the JLA and JSA had put them in), and where able to return home, with the JSA going back to Earth-2, the Champion family taking off into the ether....and Supergirl, Superman, Wonder Woman and Flash....well, they found themselves slightly out of time (though it took until Justice League of America #237 for them to find out....when they met a whole new Justice League formed in the wake of the Martian invasion that took the rest of the team out of the satellite when this all started!).
JLA and JSA....and more!).
Last Crisis On Earth-TwoStar-Spangled Kid, with the sons, daughters and other inheritors of the mantles of the Justice Society of America, and were based in California on Earth-2.
The Infinitors (minus missing Obsidian, who was involved on the Monitor's satellite) were rushing Jade to the hospital (as she had been poisoned by Mr. Bones of the villain team of Helix). The hospital they were at was the home of Dr. Charles McNider (the original Dr. Mid-Nite) and his protege, Dr. Beth Chapel.
Commander Steel (a member of the All-Star Squadron who had disappeared during World War II) and Mekanique (a new being who Commander Steel was working with for her ability to traverse dimensions).
Commander Steel was accidentally sent to Earth-1 (in All-Star Squadron #50, when Harbinger recruited Firebird) and was here to recruit Infinity, Inc. to help with some "super-powered young criminals who...now call themselves the "new" Justice League".
The Final Crisis
Here, the JLA is regrouping, as Elongated Man scouts out the damaged JLA Satellite (wrecked during the Martian invasion which helped end the original JLA and led to the newest members of the team: Vibe, Vixen, Steel and Gypsy, as well as their Detroit Bunker HQ). Elongated Man explains to Vibe about the multiple Earths (who doesn't believe him). Meanwhile, the Infinitors are checking out the Bunker, thinking something is wrong, as Fury finds Mekanique in the Med Bay, working on the cybernetic Steel, realizing they might be on the wrong side, as Commander Steel finds her, knocking her out.
Seven Soldiers of Victory, Freedom Fighters, Marvel Family, Legion of Super-Heroes, Jonah Hex, New Gods and more), all were involved in the Crisis On Infinite Earths, which changed the entire DC Universe and DC Multiverse for decades to come!
The last two issues of JLA/JSA team-ups were reprinted in the Justice League: The Detroit Era Omnibus of 2018 and in the Crisis On Infinite Earths Companion Deluxe Edition #2 of 2019, with all three JLA/JSA team ups being included in a massive multi-volume collection that included ALL the JLA/JSA stories, as well as Crisis Crossovers and Crisis On Infinite Earths.