Bald Boys Burn Brightly: The Doctors Light

Among the most dangerous of masters manipulating the forces of nature were Doctor Light of Earth-One and Doctor Light of Earth-Two. Both were bald bad guys whose thirst to quell their greedy ambitions turned their considerable intellects toward evil pursuits. And both had enmities towards their rivals, those being members of the Justice League and Justice Society.

Doctor Light of Earth-One was originally Arthur Light, a scientist who stumbled upon the means of accessing space warps, which lead him to the planet Thanagar, wherein he stole light-based technology. He would base this discovery on future equipment which he employed versus first the combined Justice League of America, and then individual members throughout the years.

In his initial foray versus the League, Light thrust that team's various members into other indimensional or sidereal worlds. Believing he had successfully exiled his greatest threat to power, the Doctor proceeded with his criminal endeavors, unsuspecting that Leaguers Superman and Batman exchanged their identities, thus allowing Superman to free his fellow heroes. Returning to Earth-One, the League were able to outmanuever Light's scheme. This would only be a temporary defeat for Light, as he was bent on overcoming the League... together or one by one.

Doctor Light of Earth-Two, was a defrocked research scientist, ridiculed by his colleagues at the university he was employed at, and decided to turn to crime. After his first foray into felony, Light was thwarted by the blind masked man known as Doctor Mid-Nite. And so, Light switched from using his light-beams to generate heat to creating elaborate holograms to manipulating plant life and controlling the human mind.

This Light attempted to form a criminal co-op in a Roman stylized headquarters, but yet again his arch-foe Mid-Nite learned of his scheme and defeated him once more. After three forays into crime, he either remained in prison or decided to retire permanently from villainy, as he was never to be seen from again. That is, unless he went by another identity, which is quite possible as there was also two other criminal geniuses named the Light... one who battled Starman time and time again... and a hooded Alexie Luthor who  made a name for himself as Superman's arch-enemy.

Arthur never had a lasting victory against any of individual Justice Leaguer nor the team as a whole. He first preyed upon the Atom, then Green Lantern, Flash, and following three more clashes with the combined group, he tried tackling the World's Finest Heroes... Batman and Superman! Despite employing various techniques, each superhero was able to compensate for Light's creativity, making the villain a repeat failure.

Seeking validation, the Doctor had several clashes with the League's  young sidekicks, the Teen Titans. When this likewise failed, Light assembled the Fearsome Five to seriously oppose the New Titans... which they did... although the mental mastermind Psimon usurped control of the criminal gang, leaving Light out in the cold.