...and that world was Earth-2, and those heroes had a next generation of heroes...who were Infinity, Inc.!
Infinity, Inc. first appeared in All-Star Squadron #25 (September, 1983, by Roy Thomas and Jerry Ordway) and they seemed to know each other and function more or less as a team, facing the World War II heroes of the All-Star Squadron (and having hints of coming from the future of All-Star Squadron, and this story playing out through All-Star Squadron #26 and All-Star Squadron Annual #2....with both teams facing the Ultra-Humanite, one in female form from the 1940s, and the other a mutated ape from the "current" time of the 1980s).
Silver ScarabJustice Society's Hawkman). Hector had some resentment towards Carter and Sheira's godson, Norda, who was half-Feitheran, and thus, had wings and could fly, as his parents could using their Nth Metal wings.
Hector eventually built himself a suit of armor from Nth Metal, that would allow him to fly, and inspired by friend and fellow "JSA brat" Lyta Trevor, as the two began dating at UCLA, he became the Silver Scarab and the two headed to JSA HQ to attempt to join the JSA.
FuryJustice Society (Earth-2) counterpart for advise, and met Diana-2, and her husband, Steve Trevor, and their daughter, Hippolyta (named after Diana's mom), who also had amazon powers! The Earth-1 Diana returned home after this meeting, and still had to deal with all her own troubles (including Sandman, master of dreams, Garrett Sanford).
Lyta transferred to UCLA, taking up a relationship with Hector Hall (whom she had known since she was a child, as both were "JSA Brats" and met over the years as their families gathered), with her revealing her plans to become the heroine Fury after Hector showed her his super-suit....and the two headed to JSA Headquarters to try to join the team, though destined instead to become charter members of Infinity, Inc.
NuklonGolden Age Atom, and son of Terri Rothstein (a scientist at Cape Canaveral, originally Terri Curtis, the daughter of Cyclotron...who you might remember from All-Star Squadron #21 to #26 and All-Star Squadron Annual #2....and Phillip Rothstein, a military helicopter pilot who died on duty). Al was a big boy, due to his mother's exposure to radiation....and played basketball, but also worked on cars and other mechanical pursuits. Albert also had quite the crush on Lyta Trevor (but never really acted on it, as she was smitten with the brooding Hector Hall). Al had been trained since his youth by the Golden Age Atom, and couldn't wait to put on a costume and join Hector and Lyta (whom had already decided to go join the JSA), putting on a costume of his own (and shaving most of his head to have a mohawk, quite a fashion statement of the 1980s). Al even had powers of his own, being ultra-dense (and later finding he could alter his density and size slightly), as well as having strength and a degree of invulnerability.
Jesse Quick, then joining the Justice League with Obsidian for a time, then decided to honor Atom by becoming the Atom-Smasher and joining the JSA at a particularly dark time in his (and the JSA's) life.
...as we look at the rest of Infinity, Inc., with members such as Northwind, Jade, Obsidian and Brainwave, Jr., and how the Star-Spangled Kid, Power Girl and Huntress fit into all of this, as well as working with Silver Scarab, Fury and Nuklon!