Darkest Re-X is the mix of many different factors, some being Darkness and Power, the most important however, being a mad professor fused with the X-Rex Chemy and Rex Vistamp Demon.

Darkest Re-X is the main antagonist of the film's transformed form. He only appears for a few scenes and has only one line, but without him, the film would be incomplete.

His way of speaking is rough, and powerful, almost like a growl or roar. The way he sounds should send shivers down your spine, not from fear, but from darkness.