Let's look at the "startling NEW super-hero from the FABULOUS 1950's!"...3-D Man! "Who in blazes?" you might ask...
When 3-D Man was next manifested by Hal, Hal's mind was in control...and he fought the Cold Warrior and beat him. This was enough of a setback for the Skrull abandon his Nixon identity and to disappear...as did the 3-D Man for a time!
...Hal had married Peggy Clark, and they had two sons, Chuck Chandler and Hal Chandler Jr., and Hal had retired the 3D-Man, concentrating instead on his career and family.
When the family discovered Bruce Banner, Hal invited him into his home (but in reality, Hal recognized Bruce as the alter-ego of the Hulk, and called the military to bring him in). At the same time, Rick Jones (a friend of the Hulk's) had encountered trouble and sent out a distress call via ham radio to the Teen Brigade and more (with the younger Chuck Chandler hearing the call on his dad's equipment). The Hulk changed in the house, prompting Hal to call on 3-D Man again (who manifested with Chuck's mind) and the Hulk and 3-D Man battled for a bit, as 3-D Man also tried to process all the changes that had happened since he last appeared! 3-D Man eventually helped Hulk leave to go aid Rick and his friends, and Hal came clean with Peggy about the 3-D Man and how the original Chuck Chandler survived within him (and dealing with their destroyed house in Incredible Hulk #252). 3-D Man also appeared in the gathering of heroes in Marvel Super Hero Contest of Champions #1 in June, 1982, but he was just a face in the crowd at that point...
the 1960s? Would 3-D Man have been a member?
It was exactly that question that led to the alternate world of What If? #9 (June, 1978 written by Don Glut, and art by Alan Kupperberg and Bill Black, taking the concept from Roy Thomas) and the formation of the 1950s Avengers, with 3-D Man joining forces with heroes of Marvel Comics of the 1950s (Venus the goddess, the Human Robot, the Gorilla Man, Marvel Boy and foe of the Yellow Claw...Jimmy Woo). The team battled a gathering of their foes, but Eisenhower did not want them to stay together as a team. This reality was developed further in Avengers Forever #4 and #5 (in 1999), wherein a Skrull posing as Nixon tried to take over America's space program in 1959...at least until Immortus (another time traveling Avengers villain) shut down this reality....
And Back Home
Godzilla), and this group reformed as the Agents of Atlas when Jimmy was injured (in Agents of Atlas #1, October, 2006, the beginning of a 6 issue limited series by Jeff Parker and Leonard Kirk, which let to the regular Agents of Atlas series which lasted 11 issues in 2009).