Nuclear powered heroes capable of transmuting matter, phasing through objects, fly at high speeds leaving an atomic trail in their midst. That is Professor Martin Stein and scientist Terry Curtis, each of whom accidentally stumbled upon the process that transformed their lives and impacted the Justice teams of their worlds.
However, Firestorm was two heroes merged into one, while Cyclotron was all alone. Stein's partner, in the driver seat of the Firestorm persona, was athlete Ronnie Raymond.
And both were, um, atom smashers! At least Ray Palmer didn't get crossways with Firestorm like ol' Al Pratt did here:
Another firebrand jock, himself tutored by an older wiser assistant (ex-boxer Slugger Dunn) was another double "R" like Ronnie, named Rod Reilly, aka...
And the neat symmetry doesn't stop there. For both atomic aces had redheads that acted as both love interests and, due to exposure to intense radiation, fellow heroes:
First is Lorraine Reilly, daughter of a New York senator, who becomes the flying flaming female known as Firehawk:
And a steel mogul's daughter, Danette Reilly, love interest of Cyclotron and sister of Rod Reilly... now known as Firebrand (the second):
A real nuclear family, this one is!