Courageous Captains - Coexisting Comets - Twin Triumphs

In the early 1950s, a librarian Adam Blake was secretly the superhero known as Captain Comet.. Adam grew up discovering he had gained superpowers due to a passing comet. These included superhuman strength, self-propelled flight, invulnerability, and telepathy. Early in his costumed career, the Captain learned he could create an autonomous energy duplicate, which he called upon on occasion. After a few dozen adventures, he encountered an exact clone spawned by a criminal, although this twin quickly perished. In fact, the missing years of that Comet clone's life would be made up by Adam, who retained his youth for decades. Blake eventually journeyed into space, leaving behind his mentor and fellow intellectual Emory Zackro and his girlfriend Lucy Torrance.

In 1942, twin brothers Michael and Lance Gallant experienced tragedy when the hanger that Michael and his plane were in exploded. Merging together using a mysterious T birthmark on their wrists, the pair merged together into Captain Triumph. In this alter ego, Lance possessed superhuman strength, self-propelled flight, invulnerability, and a form of telepathy with Michael. Together, they had dozens of adventures alongside Lance's pal Biff and girlfriend Kim Meredith.

Eventually, both Captains were attracted to superhuman teams, and parallel worlds. When Comet returned to Earth-One, he encountered the Secret Society of Super-Villains, with whom he became a sworn enemy. At this time, he became an unofficial honorary member of the Justice League of America, working with some of its members. Blake even followed the Super-Villains to Earth-Three, and later Earth-Two, before he returned to his home world once more. 

As for Captain Triumph, Lance and Michael early in their career traveled to Earth-X, perhaps with the aid of Rod "Firebrand" Reilly who had an unexplained ability to cross dimensions. This world was home to the Freedom Fighters, former heroes of Earth-Two like Triumph who ventured to this hero-less planet to protect it from the Axis Powers. His stay there was brief, and the Captain returned to Earth-Two, where he joined the All-Star Squadron and reunited with Kim and Biff.