Bumbling Daily Planet reporter Clark Kent is the Man of Steel: Superman. An alien from a destroyed planet called Krypton, he has superpowers from strength, speed to flight thanks to the yellow sun. As he went to Gotham to present a check from Metropolis, Metallo attacked him and this was when he first met Batman. Wanting nothing to do with another superhero, nor the new Justice League, he ended up fighting three of Batman's rogues before falling under the control of his foe Lex Luthor. After a fight against Batman, which spanned from Metropolis to Gotham, Superman was eventually freed from the control and stopped Luthor's evil plot. Later, he found a trust with Batman and decided to join the League after all. He is voiced by George Newbern, reprising the role from Justice League and Justice League Unlimited.

Info from Wikipedia