Eyedol

Eyedol is the main villain and final boss from the video game Killer Instinct.

Overview
Eyedol, is a two-headed, ancient mystical warlord who was trapped in a dimensional prison in the distant past. Ultratech released him to be the final combatant in the tournament. It is shown in Killer Instinct 2 that the person Eyedol was trapped in combat with was Gargos, the final boss of that game. Eyedol is the only character that does not have an icon in the character select screen, however in both the arcade and Super Nintendo versions he is a secret character that can be played as by selecting a specific character (Riptor in earlier arcade versions and Cinder in later arcade versions and in the Super NES version) and pressing a combination of buttons before a round begins. He is also the only character in the game with no special finishing moves, such as No Mercy moves, ultra combos, or humiliations that the other characters possess; however, he more than compensates for this lack of ability with a limited ability to heal.