Superman is a 1987 NES video game by Kemco based on the DC Comics character.

[3] In the game, the player controls Superman on a quest to save the city of Metropolis from the evil Lex Luthor and a gang of criminals that were exiled from the planet Krypton.

One of the main differences from the comics was that Superman's x-ray vision was used to make invisible enemies visible.

Players start out the game as Clark Kent but can change into Superman (provided that they have enough Super Power) by entering into one of the phone booths that are scattered throughout the city.

Whenever Superman entered the Daily Planet building he would always revert to Clark Kent, no matter what his power level was.