It's true there are a lot of characters, but they mostly get a chance to shine in individual episodes a few at a time as the rest are relegated to background duty, while getting involved in a multi-episode story arc.
I'm not sure what theis Saturday's episode will be. It might either be "Divided We Fall", the conclusion of the Cadmus Arc, or "Epilogue", the Batman Beyond flashback story.
If it's "Divided We Fall", the short story of the previous episodes is this:
The government's Project Cadmus wants to keep metahumans in check, they get Luthor to help, using Cadmus technology Luthor remote fires the Watchtower's cannon at New Mexico, JLU gets blamed, the founding members except Batman surrender to the authorities as a sign of good faith, Cadmus sends their cloned metahuman team the Ultimen, led by Supergirl's adult clone Galatea to "sanitize" the Watchtower, Batman proves to Amanda Waller of Cadmus that Luthor is behind this and they confront Luthor....
Just watched today's JLU episode. I seems to be the concluding story associated with Lex Luthor becoming Brainiac and about to takeover the world except for the 7 original JL members fighting to stop him. Good stuff seeing the original Superman, Batman, Wonder Woman, Flash, Green Lantern, Martian Manhunter and Hawkgirl back in action again.
Whaddyaknow... today's episode was "Divided We Fall", the finale in the Cadmus arc.
They even featured the Speed Force in the end, the source of the power of all the DC speedsters like Jay Garrick (Flash I), Barry Allen (Flash II), Wally West (Kid Flash / Flash III), Bart Allen (Impulse), the Tornado Twins, Max Mercury and Johnny Quick.
Och, woke up late this morinng.. And the previous episode was the one I watched. How did it end? Synopsis please.
Lex is confused because Brainiac emerges out from his body into a fusion of both of them. Brainiac tells them it was because he had put a nanomachine within Lex which cured his cancer and gave him superhuman strength, but also retained Brainiac's consciousness.
JLU and Mrs Waller try to apprehend him, but the entire top of LexCorp building is transformed into a Brainiac headship. The founding members of JLU blast it out of the sky, but it was only a ruse, the Lex / Brainiac entity escaped underground.
Lex leads Brainiac to Cadmus where they stored the Dark Heart (alien super nanomachines) which the JLU defeated some episodes ago (which Plo Strax-Aix mentioned above). They absord the nanomachines and transform into a uber-Lexiac, and starts to create a machine that will absorb all data in the universe and destroy it, ultimately allowing them to recreate the universe as they see fit and rule over it.
The JLU stuck on the watchtower are unable to beam down because of the damage caused by the Ultimen the previous episode. The ones in New Mexico helping with the evacuation can't reach Lexiac in time. Only the founding members will be able to do anything in the time available.
They discover that Lexiac is creating a giant machine out of the Cadmus Washington DC office. They attack, but Lexiac creates a nanotech replica of the Justice Lords, the mirror version of the 7 JLU founders, to defend the building.
JLU wins the battle, so Lexiac comes out to take care of the situation personally, and ALL but Flash is rendered unconscious by Lexiac's energy blasts.
At first Flash seemed like he was about to stand up to Lexiac alone, but surprisingly... he fled!
Thinking it was fine, Lexiac resumes his work, but then from a different direction Flash comes running at high speed hitting him once. Some of Brainiac comes off Lex.
Before he could think, Flash runs by and hits him again. And again, and again until it seems like he's running around the world many times and arriving to punch Lex over and over again.
Then when Lex is down, he jumps on Lex and starts hammering him at superspeed with both hands. The rest of the League awakes, but before anything can be done, Flash and Lex explodes.
When the smoke clears, Lex is totally naked with no sign of brainiac on his body. Flash was vibrating so fast that he seemed transparent. Suddenly he disappears.
Thinking Flash had died, over-exerting himself, Superman almost killed Luthor with his heat vision, but stands down at the last moment.
But J'onn telepathically scans the area and discovers that Flash is still there, but he's weak. Shayera stumbles across a portal, which Flash descibes as a "Speed Force" and with the helps of the others, pulls Flash out of it. He said if he gets pulled into it again, he wont be coming out.
In the background, Mrs Waller calls the president to recall the airstrike.
Later, in an address to the other members of the League and the public, Superman announces that the Watchtower will be dismantled and the JLU will be disbanded. But Green Arrow reminded him of what they just they did and the world needs a Justice League. So they relent and say there will be changes. The Watchtower's fusion cannon will be decommissioned, and they will also create a base on Earth for better relations with the government.