Gate (MMX)

Bwah ha ha ha! It's finally done!! I'm going mad and it is so... liberating! ...No. The plan has only just begun... I'm going to bring all low-grade... Reploids into submission! Those too simple to understand my work!! I'll build an ideal world only for Reploids... a wonderful world where I control everything!

Gate's discovery and subsequent madness
Two weeks after the Eurasia incident, Gate visited the crash site. There, he found what he at first thought was mere debris, but which he discovered was actually a sample of Zero's DNA. He immediately began analyzing it, and after roughly a week of study, he was turned insane by its viral power. With the help of the mysterious Reploid scientist Isoc, he decrypted 99.98% of Zero's DNA, using his new knowledge to create the Nightmare and High Max, along with resurrecting eight of his deceased subordinates.

Mad with power, Gate formed a plan to conquer all Reploids. He dreamed of his own society of advanced Reploids, independent from humanity; all other "low-grade" Reploids would be brought into submission or exterminated. To accomplish this, Gate created a discolored copy of Zero called the Zero Nightmare, which Isoc publcly blamed as a scapegoat for the Nightmare Virus. Isoc encouraged Reploids all over the planet to join High Max and the eight Nightmare Investigators to hunt the Zero Nightmare before it was too late. In reality, Gate intented for as many Reploids as possible to be exposed to the Nightmare Virus, so they could either survive to prove their worth or succumb to the Nightmare and become mindless slaves.

When the Maverick Hunters destroyed one of Gate's Nightmare Investigators, Isoc shared the news. Isoc suggested simply using High Max to subjugate the world, but Gate insisted on using the Nightmare. He asked Isoc about his search for Zero, allowing him to continue despite having no need for Zero's DNA.

Once the Maverick Hunters destroyed all eight of Gate's Nightmare Investigators (or defeated High Max), he personally contacted Hunter Base to invite X and Zero to face him in his Secret Lab. He believed this would be his opportunity to finally analyze the two ancient robots. After they destroyed the Nightmare Mother, Gate finally revealed that Zero's DNA is what he used to cause the Nightmare in the first place