Nebula Gray

Nebula Grey (ネビュラグレイ) is a dark, monstrous program made entirely of Dark Power, created by Dr. Regal.

Game History
Nebula Grey is the final boss of Mega Man Battle Network 5. When Team ProtoMan/Team Colonel attack Nebula's HQ and deletes the Darkloids, the Darkloids in turn absorb them one by one into a dark vortex until MegaMan is the only one left. The Darkloids tell them that the vortex leads to the Dark Galaxy, a dark world created by Dr. Regal made entirely of darkness and Nebula Grey, a Dark Star at the center of the Dark Galaxy. After the team reaches and confronts Regal, they learn of his plan to taint the world with evil by linking the whole world’s souls by using SoulNet and then installing Nebula Grey into SoulServer to taint the world with evil.

MegaMan then jacks-in into SoulServer and confronts Nebula Grey. At the end of SoulServer, he finds Nebula Grey to be a dark vortex with a blue flame hovering on top of it. Regal then explains that Nebula Grey is actually the digitized form of man’s evil soul. He then uploads that data into a system that converts it into various forms. He reveals that Dark Chips are made by grafting Nebula Grey's amplified evil souls into chip data, meaning that the human dark souls are the source of Dark Chips. Nebula Grey then transforms into a giant monster composed of a flaming head on a body of Dark Souls, having a vortex in the place of legs, and chains all over his chest and back. MegaMan then engages in a battle with Nebula Grey and wins.

However, dark souls return from inside the vortex and cover MegaMan, tainting him with evil. Lan takes off his MagnoMetal amulet to communicate with MegaMan’s soul using SoulNet, but fails. Then the voice of Lan’s grandfather comes out of nowhere and tells Lan that he’s always linked with MegaMan. MegaMan then transforms into his human form, Hub, and closes the vortex with Nebula Grey and locks him in a small metallic capsule.

However, the blue spirit of Nebula Grey returns and attacks a weakened MegaMan, only to have Colonel/Protoman save him by catching the spirit. MegaMan tries to shoot but is too exhausted, due to his attempt to lock Nebula Grey in the capsule. This takes a huge toll on MegaMan due to the amount of power that Nebula Grey had. So his friends and the rest of the Team come and lend him their power through SoulNet. With a powerful charged shot, he permanently destroys Nebula Grey, along with SoulServer. Regal’s memory is then erased by Dr. Wily and he then starts a new life as a law abiding scientist.

Within the Nebula Area resides the birthplace of the Darkloid King Chaos, also known as Chaos Lord. It can take on several forms; MegaMan’s Dark Soul, Bass.EXE, or Nebula Grey (although one can technically assume this is meant to be Bass).

Anime History
Nebula Grey doesn’t appear in any episode of the series, but appears in the Japanese-exclusive movie Rockman EXE: Program of Light and Dark, which takes place somewhere in the middle of Stream. His appearance here is similar to the one in the game, however, he moves a lot and concentrates more on physical attacks. The only major difference in his appearance is the blue spirit, which doesn't appear here.

After his defeat in Axess, Dr, Regal had been transformed into data and became stuck in the cyberworld. He then begins to apply a new evil plan of using the Tadashi Hikari program to activate the Spectrum program, which causes beams of light to shoot through the real world transforming everything they touch into data. Regal wants to transform the whole world into network data, and to assist him in his plan, he creates the monstorous program Nebula Grey. He even captures Bass, brainwashing and manipulating him to attack MegaMan. Colonel then interferes and Bass is returned to normal. When MegaMan is about to destroy the Tadashi Hikari program, Nebula Grey appears and absorbs it, while the NetNavis retreat. Lan, Chaud, and Raika infiltrate the Netopian military base where Regal resides. There they meet a man called Baryl, who turns out to be Colonel’s operator. MegaMan jacks in to stop Regal, while Bass also appears, intent on having his revenge on Regal. However, neither of them is any match for Nebula Grey, who defeats them both with ease. MegaMan and Bass then unite, creating BassCross MegaMan. He then completely obliterates Nebula Grey, resulting in Dr. Regal summoning a black hole in a desperate and suicidal attempt to destroy them all. Bass pushes MegaMan out of the black hole’s way as he gets sucked in himself. Bass then absorbs Nebula Grey’s power by himself, while Regal disappears, as the base crumbles.

Nebula Grey's silhouette appears during the confrontation between Bass and Slur in episode 51 of Stream, showing that Bass has indeed absorbed the power of Nebular Grey after the events of the Program of Light and Dark.

Forms
Like Duo, Nebula Grey is a final boss that has 4 versions. However, unlike Duo, these versions can all be fought on the same save file.


 * Nebula Grey (2000HP) can first be fought through the door way to the final battle at Nebula’s HQ. Once the player enters, they will watch a cutscene and then jack in. Saving or using the Party Battle System (Double Team DS) at this moment is not possible. This version can be fought repeatedly.


 * Nebula Grey α (2500HP) can be found at the end of Nebula Area 6, once the player has defeated all the DS Navis. This version is actually the Chaos Lord taking on Nebula Grey's form. It can be fought only once.


 * Nebula Grey β (3000HP) can be found in the same place as the previous version, after the player has defeated all the DS Navis with an average of less than 45 seconds each. Once again, this version is Chaos Lord taking on Nebula Grey's form. It can be fought repeatedly.


 * Nebula Grey Ω (4000HP) can be fought in place of the first version, upon obtaining the 7 icons. Once this version has been made available, it is impossible to face the first version again, as the Ω version replaces the first. The Ω version can be fought repeatedly and beating it signifies the completion of the game, with a special picture of MegaMan and his Teammates appearing at the end.

Attack
Nebula Grey is invincible. The only way to damage him is to attack the blue flame orbiting him. In the movie, he does not have all these weapons, but is much stronger than his game version, as he is seen to single handedly defeat MegaMan and Bass.


 * Black Prominence: Nebula Grey constantly fires dark flames at MegaMan in a snake shape that is stopped by hole panels.
 * Grave Fire: Sends a raging dark flame that always targets Megaman's panel. It then acts like a Flame Tower, tracking the player's movement.
 * Dark Chip: Summons Dark MegaMan.EXE, who uses a random Dark Chip:
 * Dark Thunder
 * Dark Meteor
 * Dark Lance
 * Dark Sword
 * Hellflame Serpent: Disappears and turns into a serpentine figure of himself and then rushes at MegaMan.
 * Thousand Death Hand: Releases several leeching hands that drain MegaMan’s HP and recover his own.

Trivia

 * Nebula Gray is the first final boss in Megaman history that the player can battle without first dealing with a sub-boss.