Alexander Luthor, Sr. was born into the partially "reversed" universe of Earth-Three, where the colonial British colonies successfully broke away from the Empire of United States in the 1700s and President John Wilkes Booth was assassinated by actor Abraham Lincoln. 
Finding solace in deep scientific research and invention, Luthor created many notable and advanced devices which brought him public notice. But it was not until his native Earth-Three became the intended target of his extra-dimensional counterparts Alexei Luthor of Earth-Two and Lex Luthor of Earth-One that Alexander Luthor decided to openly fight as a champion for his Earth, for fear of losing the entire world to his counterparts' plan. Realizing that he could not win the day alone against such odds, Alexander recruited the help of his counterparts' greatest enemies - namely, their respective Supermen.
Bringing Kal-L and the Earth-One Superman to Earth-Three, Alexander enlisted their aid to in directly confronting the villainous Luthors, who had decided to destroy Earths-One and Two and use Earth-Three as their new base of operations. The two evil Luthors had recruited Ultraman, Earth-Three's "Superman" to become the muscle in their scheme, and the evil Superman easily overpowered the two extra-dimensional heroic Supermen due to the fact that he was powered by their greatest weakness, Kryptonite. Spurred on to fight directly against Ultraman by the Lois Lane of Earth-Three, Alexander Luthor donned super armor and confronted Ultraman. (It is clear this was not the first meeting of the two enemies, as Ultraman recognized Alexander, but the details of their previous encounters remain unknown). Using his advanced weaponry, Alexander defeated Ultraman by temporarily "de-phasing" him, which allowed the two Supermen to recover and defeat Alexei and Lex Luthor, who had already begun squabbling amongst themselves. (The two could not agree on whether to destroy their home planets, as Lex had family to protect while Alexei either had no living family or had none he considered worth saving).
With Alexei and Lex Luthor defeated, Alexander returned the two Supermen to their native dimensions and Ultraman to his prison.
Spurred on to remain an active and open heroic presence on Earth-Three by the two Supermen and Lois Lane, Luthor decided to continue his heroic exploits. He later married Lois Lane, who would become pregnant with his only child.
Over the intervening years, Alexander Luthor would face and defeat Ultraman and the other members of the Crime Syndicate again many times before the Crisis on Infinite Earths came to Earth-Three. To halt the Anti-Monitor's energy wave, Luthor was forced to join forces with his enemies, but, despite their power, they were unable to stop the advancing wall of Antimatter and ironically died fighting to protect a world they once strove to conquer. 
Alexander and his wife were able only to save their son, Alexander, Jr. ("Alex") from the complete destruction of their reality, by placing him in a capsule which would take him to Earth-One. Alexander Luthor, along with everyone else native to his universe, died in the Anti-Monitor's attack. The existence of the Earth-Three reality was ultimately erased from all history. Alexander Luthor, Jr. survived not only the demise of his native reality, but also the collapse of the Multiverse. He alone maintained memories of Alexander Luthor, Sr. and his world.
Powers and AbilitiesEdit
Alexander Luthor, Sr. (Earth-Three) possessed no superhuman capabilities.
Alexander Luthor, Sr. was a brilliant inventor responsible for creating various highly advanced scientific devices for the benefit of his world.
Average: Alexander Luthor, Sr. possessed the strength level of a man his age, size and weight who engaged in minimal regular exercise.
Alexander Luthor, Sr. (Earth-Three) was completely unskilled in hand-to-hand combat, and relied heavily upon his scientific wizardry to defeat his opponents.
Alexander Luthor, Sr. wore a specially designed super-suit and matching helmet, which enabled him to fly as well as turn intangible.
Self-powered flight via super-suit.
Alexander Luthor, Sr. employed a wide variety of advanced weaponry of his own design. Nearly all of these items however have never been openly revealed.
- 9 Appearances of Alexander Luthor, Sr. (Earth-Three)
- 7 Images featuring Alexander Luthor, Sr. (Earth-Three)
- Quotations by or about Alexander Luthor, Sr. (Earth-Three)
- Character Gallery: Alexander Luthor, Sr. (Earth-Three)
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