When Superman, portrayed with an impeccable resemblance on film most recently by Henry Cavill, was first introduced in Action Comics #1 in 1938, he possessed many of the abilities he is best known for today, such as the strength of a million men, speed that outweighs a freshly fired bullet, eyesight that would convince an eagle he needs a new optometrist, leaping tall buildings in a single bound, and incredible durability.
However, it was not until by the mid-1980s that he would upgrade from durability to invulnerability, making him impervious to much heavier artillery, as well as x-ray vision and flight, which, apparently, comes from his telekinesis.