In the 1992 original game, an audits screen on the arcade machine's diagnostics menu displayed a macro written by series co-creator and programmer Ed Boon in order to catch coding errors...It was spelled as ERMACS a pluralized contraction of error macroas in how many times the program would execute. First seen on the audits screen below a counter titled "Shang Tsung Beaten" (in reference to the game's final boss fight) in early revisions, it went unnoticed by players and fans until Boon added the hidden character Reptile into the third revision of the game. ERMACS was now listed with "Reptile Appearances" and "Reptile Battles" on the audits menu, which provoked players into searching for what they believed was a second secret character named Ermac hidden in the game...
...Electronic Gaming Monthly published a submitted screenshot from the first Mortal Kombat in the "Tricks of the Trade" column of their October 1993 issue (#51), along with a letter from "Tony Casey" that claimed he had played against a red ninja named Ermac with a low-quality Polaroid of the screen as evidence...the photo was a doctored image of yellow ninja character Scorpion in a victory pose on the "Warrior Shrine" stage from the Super NES version of the game, tinted red and with a superimposed center-screen phrase that read "Ermac Wins."Two issues later (#53, December 1993).