"You'd have to be crazy not to be nervous."
History
Origin
Owlman's origin almost parallels that of Batman, with some major changes: Owlman is really Thomas Wayne, Jr., Bruce's younger brother from an alternate universe. As a young boy, Thomas's mother and older brother were killed by the corrupt police of Gotham City, when his father refused to accompany them for questioning. Blaming his father for their deaths, Thomas Jr. vowed to get revenge on the world of law and order. Like his counterpart, he trains his mind and body to mental and physical perfection, but uses his talents for criminal purposes and the forces of evil. He then formed his elite organization of villain master minds known as the Injustice Syndicate.
Deep Cover for Batman!
After his team took over their Earth, they decided to use a device known as a Phase Oscillator they stole from Owlman's arch-enemy, the Red Hood, that could open gateways to other worlds. Once on our world, Owlman was promptly defeated by Batman, who infiltrated the Injustice Syndicate as Owlman.
Game Over for Owlman!
Somehow escaping, Owlman masqueraded as Batman in his doppelgänger's old costumes and framed the Dark Knight for crimes around Gotham City. This sent many of the Caped Crusader's allies after him, forcing the Batman to work with his top foe, the Joker. On Batman's Earth, he gathered Black Manta, the Brain, Gorilla Grodd, Clock King, Gentleman Ghost and Dr. Polaris and captured the heroes. He even turned Joker on Batman. Fortunately in a battle royale, Batman gathered together Batmen from parallel Earths and battled Owlman's syndicate, freeing the other heroes.
In the end, Owlman was defeated alongside Joker, sending the villains to Iron Heights prison and Owlman back to Earth-3 under the intensive care of Justice Underground.
Powers and Abilities
He has virtually all the abilities of Batman as in martial arts and a utility belt that houses tools he uses for crimes.