Adam Blake and Henry King Junior inherited immense brain power, far beyond those of their fellow man in the 20th century. While Adam's true counterpart on Earth-Two was Kirk Jason aka the Immortal Man, and Henry's counterpart on Earth-One was Lia Briggs aka Looker, there were several points of similarity between today's two featured heroes. Inspired to assist others by adopting costumed aliases, Adam's Captain Comet and Henry's Brain Wave Junior, had adventures that spanned decades. Each had the requisite power-set of telepathy and telekinesis that all mental masterminds possess, as well as other distinct abilities. Both favoring the red and blue color-scheme, each made reputations for himself by courageously combating the Secret Society of Super-Villains and a particular pair of super-smart simians that would cause them considerable angst. And each fell two ladies tied the Green Lantern mythos, as Adam caught the eye of flight attendant Deborah Darnell (aka Star Sapphire) who would soon become his most consistent foe, and Henry grew to love Green Lantern Alan Scott's daughter Jennie Hayden (aka Jade). Both romances were doomed to failure, due to Sapphire's evil disposition and Junior's confusion after being mental "transfused" with the brain of his father upon the latter's death.
Henry King Junior himself used the mental powers inherited from his wicked father Henry King Senior, aka the original Brain Wave. Capable of projecting mental blasts, levitating himself and other objects, and creating realistic illusions. Early in his career, Junior attempted to enlist the membership of the Justice Society of America, with near catastrophic results. Of course, showing up at their headquarters appearing like his father (to earn their respect? attention?) rather than as himself caused an immediate conflict. Regardless, after traveling time Brain Wave Junior recruited other heroes from the 1940's All-Star Squadron, although once more lacking the polish of diplomacy of his fellow heroes.
After following the Secret Society throughout the multiverse, Comet was instrumental behind the scenes in aiding the same Justice Society that would later spurn Junior in defeating this first incarnation of the team (of which Junior's father was a member of its second incarnation a few years later). After dispatching this team, and reconciling his own troubled powers thanks to the assistance of Superman, Comet went into semi-retirement until called upon during a Crisis to assist the multiverse once more.
Both Captain Comet and Brainwave Junior were outcasts of the worlds they were born into. Each was bequeathed abilities that set them apart from most of their contemporaries, and this also caused them to have difficulty at times reconciling between good and evil despite their own inherent attributes towards justice and fairplay. While seeking out those on the same side of the law, Junior was a brief member of Infinity Inc and Comet an ally of the Justice League, each ended up withdrawing and becoming very much the loners they were. Legends in their own mind.