Superman

"Faster than a speeding bullet! More powerful than a locomotive! Able to leap tall buildings in a single bound! ("Look! Up in the sky!" "It's a bird!" "It's a plane!" "It's Superman!")... Yes, it's Superman ... strange visitor from another planet, who came to Earth with powers and abilities far beyond those of mortal men! Superman ... who can change the course of mighty rivers, bend steel in his bare hands, and who, disguised as  Clark Kent, mild-mannered reporter for a great metropolitan newspaper, fights a never-ending battle for truth, justice, and the American way! And now, another exciting episode, in The Adventures of Superman!"

Superman is a comic book superhero who appears in DC Comic books published by DC Comics since June, 1938. Created by Jerry Siegel and Joe Shuster in 1932, the concept was sold to Detective Comics, Inc. (later DC Comics) in 1938 Superman has appeared in comics, radio serials, television programs, films, newspaper strips, and video games. The character's appearance is distinctive and iconic: a blue, red and yellow costume, complete with cape, with a stylized "S" shield on his chest.

Superman  was born   Kal-El   on the planet   Krypton, before being rocketed to   Earth   as an infant by his scientist father   Jor-El , moments before Krypton's destruction. Discovered and adopted by the Kents, the child is raised as   Clark Kent   and imbued with a strong moral compass. Very early he started to display superhuman   abilities, which upon reaching maturity he resolved to use for the benefit of humanity.

 On The Big Bang Theory, Leonard is the big Superman fan who uses for his passward his given Kryptonian name Kal-El.