Reverse-Ultra

This version of Ethan Masters, also known as Ultraman for a short period of time, hails from a parallel universe where he failed in defeating Scary Zombie. In this alternate reality, Scary Zombie ultimately enslaved humanity after slaying the super-powered populace. Ultraman made a deal with The Yellow King and was imbued with supernatural abilities and powers, which Ultraman used to defeat Scary Zombie. As a result of making a deal with the Yellow King, Ultraman became the latter's servant and personal assassin.

Ultraman's newfound powers began to deteriorate him mentally and physically leading to him taking drastic action in ensuring his own survival, this included hunting down parallel versions of himself; killing them, then absorbing their life force to sustain his own. Ultraman eventually came into contact with the prime Ultraman and was subsequently defeated in combat before being imprisoned for an indefinite amount of time. Dubbed Reverse-Ultra by The MTVBusters, Reverse-Ultra is a recurring foe.

Reverse-Ultra will eventually succeed in killing the prime Ultraman, although he himself will be killed once and for all by Ultraman's son who subsequently takes up the mantle of Ultraman himself.