Titanic Teams: Batallions of Brave and Bold

Two tremendous teams in two very different eras that reflect quite a bit with one another. The Legion of Super-Heroes was the 30th century's premier protectors on Earth-One in a time when a variety of supervillains and interplanetary intrigue sparked a need for super powered teenagers to band together under R.J. Brandt's sponsorship. Inspired by the 20th century's Superboy, the Legion had throughout its entire history over forty members serving in one status or another... combating foreign foes like the Khund or their opposite number, the Legion of Supervillains.

In a parallel universe of Earth-Two, that world's largest superhero organization was the All-Star Squadron during the early to mid 1940's. However, it had no equal on Earth-One during that time period, just as during the 30th century there was no large team of costumed crusaders. However, there was still the massive Space Legion, who although said to operate in the "21st century" (just as the Legion of Super-Heroes was alleged to exist in its first appearance), the future setting of Rock Braddon's Legionnaires matches that wherein Cyclone, Blaze Barton, Rex Cosmos, Don Drake, Mark Marson and their allies existed in that world a thousand years from today. Although the Space Legion, the Super Police and the Federal Men were all separate entities, each was a part of the protective government agency of their day. Other heroes just as Halk Kar and Keith Everet who were counterparts of the Super-Heroes Mon-El and Colossal Boy operated concurrently.

The Justice Society had in fact encountered a heroic team a thousand years from their era, the Defenders, who aided them in obtaining key items to assemble a bomb defense formula to use in the 20th century. However, the time travelling tyrant Per Degaton... counterpart to 30th century's Brainiac Five... sabotaged the device after its initial test. The Society would venture back to 30th century several years later when recruited to apprehend the Chameleons who infiltrated Earth-Two during that time period, which evidently neither the Space Legion nor the Defenders could defeat. Which they accomplished.