These two red headed powerhouses were the cornerstones of their respective teams of teen titans. Both are expert pilots with a style for their respective ages of introduction to pop culture of the 1970's and 1980's, as seen by their distinctive hair styles.
Big Bear was one of the young champions of the alien city of Super Town hovering over planet New Genesis. Along with four other youths known as the Forever People, he used his super strength and ability to increase his density and, through his Super Cycle, to phase through objects. Traveling to Earth-One, the team defended it and the universe from Darkseid's machinations throughout the past and present. Later, they'd leave their adopted home for another world.
Nuklon aka Albert Rothstein was a founding member of Infinity, Inc., and sought to live up to the mantle of his god father the Atom of Earth-Two. Utilizing his super strength and ability to increase and decrease his density to become near invulnerable and to phase through objects. His team banded together to defeat the plots of Ultra-Humanite both in the past and the present. He and his allies would remain as the next generation of his planet's protectors.