[Astromancer]

Try this one...

Krypton-14

Krypton-14 is a Q6 world (local year 1975) with "Superheroes" like most Krypton worlds. It had Supers show up in the 1940's and then fade in numbers and power for a time. Then in the late 1950's supers comeback in large numbers. The Sentinels are the elite group (JLA/Avengers) and have members roughly equivalent to Superman, Mary Marvel, Wonder Woman, Martian Manhunter, Auquaman, Flash, Green Lantern, Nightshade, Batman, Phoenix, Captain America, Wasp, Zatanna the Magician,Spiderman, Plastic Man, Storm, Firestorm, Atom, Hawkgirl, Black Canary, Red Tornado, Starman, and Cirsi of the Eternals. A scary powerful group.

Recently, Homeline has been contacted by the Sentinels. They don't want a war, they don't want to blow the secret (they won't tell their own people, they've figured out the consequences) but they need help against Centrum.

Centrum has lined up with some large groups of Super villains (think Hydra and Ras-al-Ghul's League of Assassins, teamed up with and injustice league based on the more competent B-list super villains of DC and Marvel). The plan seems to be to attack Homeline with large squadrons of super villains and then take over Krypton-14.

Homeline doesn't like working with in the know locals, but this attack is already out of hand. Teaming up with superheroes might be the way to prevent the total destruction of Homeline's majors cities and infrastructure not to mention millions of lives.

It's the aftermath that will be tricky. Centrum has clearly lost it and allies like the Sentinels might be the only way to survive.