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Dr. Regal is the main antagonist of MegaMan NT Warrior Axess, and the leader of Nebula. Originally working with the Darkloid ShadeMan.EXE to bring terror to the net, he eventually reveals his true ambitions. He is the adopted son of Dr. Wily alongside Ms. Yuri.
In the MegaMan NT Warrior anime series, Dr. Regal is a scientist from Kingland and a worldwide authority in the field of "Super Energy". In the past, he was rescued from a plane crash by Duo, who selected him as a probe to monitor life on Earth, and was adopted by Wily. At that time, he was experimented with and subjected to an intense brainwashing procedure, and isolated within Wily's island research facility. Years later, while snooping around Dr. Wily's computers, he found out the data of Baryl's Crest of Duo that Wily had discovered and stored. He robbed that data along with copies of Wily's Dimensional Converter research and ran off with Ms. Yuri eleven years prior to Stream.
In Axess, he is requested by Dr. Hikari to look over a Dimensional Converter used by the Darkloids to substantiate in the real world which the Science Labs had managed to capture. He and Dr. Hikari knew each other since time ago, and Dr. Regal had built the energy system of the Dimensional Converters that SciLabs were experimenting with.
He masquerades under this false identity for some time, but is eventually recognized as the leader of Nebula, who has been collaborating with the Darkloids to cause terror and fear across the world and spread Dark Chips alongside his second-in-command, Ms. Yuri (Ozono Yuriko). Partway through the series, Regal's Navi, LaserMan, usurps the Darkloid throne and disposes of the former leader, ShadeMan, as he had become too distrustful of his pact with the human.
Nearing the end of Axess, Regal comes out of hiding in outer space while Ms. Yuri completes the final tasks required for his plan to be put into motion. He abducts Navis from NetCities across the world for use as fuel for his Dimensional Converters, and unveils Regal Tower, a skyscraper-like contraption that initiates a globe-wide Dimensional Area. Using a Dark Synchro Chip, he performs Cross Fusion and brutally deletes ShadeMan, who had returned to exact revenge on the treacherous human. With several regular Synchro Chips stolen from SciLabs at the beginning of Axess, Regal then grows in size and attacks major cities around the world. He sets his sights on destroying SciLab, but is defeated by Lan and MegaMan in their Full Synchro formation and disappears (though it is implied that he dies in the Japanese version).
Regal resurfaces in the movie, Rockman.EXE: Hikari to Yami no Program. After his defeat in Axess, Regal was thrown into the Undernet along with LaserMan, his body fragmented into bits of data. While there, he discovered the dormant Wily Program and merged with it to become Nebula Gray. As a side effect of the transformation, Regal gained the ability to secrete protoplasmic humanoids as his soldiers, but could no longer exist in the real world without a Dimensional Area present, though Dimensional Converters remain freely accessible to him. He captures Bass and manipulates him to do his bidding, hoping to acquire the Tadashi Hikari Program from the Trinity Brain corporation, which would allow him to reach his final evolution. At this time, Regal also unleashes the Spectrum phenomenon to invert the real world and Cyber World, with his goal being world destruction. He is again confronted by his foes and defeated, though they narrowly escape a black hole summoned by the villain in a last ditch effort to do away with them.
Regal emerges alive in the Past Tunnel during the second half of Stream and separates MegaMan's Dark Soul from him to create Dark Rockman.EXE. He commands his new subordinate and Darkloid followers to obtain the Crest of Duo from the thirteen Cross Fusion members, and uses them in the final episode of Stream to gain access to Duo's comet, despite Dark MegaMan's deletion at the hands of Slur. With Duo's great technology finally in reach, Regal briefly takes on a serpent-like appearance and god-like powers, then attempts to destroy a CrossFused Mayl. However, he is killed by Duo by having his energy depleted.
He appears in episode 47.
He appears in the final episode of Stream, where he attempts to take control of all of Duo’s technology and powers. Despite initially being successful, Duo simply kills him. His remains are found on Duo’s Comet by the Cross Fusion Members.