Brotherhood of Metallix

The Brotherhood of Metallix is the final result of Project:Metallix. While originally Project:Metallix was originally supposed to have as result a brotherfor Sonic, various events also related the Brotherhood of Metallix with the Prower, Acorn, Elidy, Slystone and Haltmann families.

The initial Project:Metallix
Originally, Project:Metallix was supposed to be Sonic's mechanical brother. The original design was made by Bowser Jr., the first Metallix being built out of Mecha Sonic's parts, dubbed "Metal Sonic" and presented to Sonic on the day Tails was born. Dr. Ovi Kintobor added a self-destruct program to prevent Metallix from betraying Sonic.

Metal Sonic then absorbed seven Chaos Emeralds and renames himself "Metallix".

The Brotherhood's concept
A second Metallix was built by Grimer Wormtongue, Dr. Robotnik's chief scientist, in am attempt to take over Miracle Planet. That Metallix, however, betrayed Grimer when the first Metallix convinced him that they are brothers and only two members of an "elite brotherhood of robots made in Sonic's image". The second Metallix then sacrificed himself to stop Robotnik from destroying Miracle Planet.

Robo Sonic v.2.0 was also convinced to betray Robotnik by being convinced that he and the first Metallix are brothers. He was upgraded by Nate Morgan, Dr. Ovi Kintobor and Bowser Jr. to a Metallix and renamed himself "Commander Brutus".

Official creation (Mecha Sonic Saga)
When Sonic was tossed in space, King Acorn ordered the building of 100 Metal Sonics, occasion on which the second Metallix was rebuilt and given the identity of Shard.

When Sonic returned from space, the Metal Sonic Troopers were deactivated, but the first Metallix, who lost his sanity when Sonic was tossed in space, reactivated them. These Troopers then made the first Metallix their emperor, officially forming the Brotherhood of Metallix. Prior to the activation of the Metal Sonic Troopers, Grimer quitted working for Robotnik and became Emperor Metallix' right hand man. The Brotherhood of Metallix then assisted Emperor Metallix into achieving godlike power by absorbing all Chaos Emeralds in the universe, but they're stopped when Emperor Metallix revealed he was Sonic, roboticized. Emperor Metallix then sacrifices himself in order to help Tails start the Great Harmony.

The Brotherhood of Metallix, not wanting to lose their emperor, finds a Phantom Ruby, incorporate it into a new body for Emperor Metallix and activate the Phantom Ruby with a device that was supposed to revive King Acorn.

OP Freedom Fighter group
The Brotherhood of Metallix then started aiding the Freedom Fighters into their quest to free Mobius from Robotnik's tyranny. It upgraded Knothole to be an automated city controlled by a supercomputer who, at Shard's request, turned out to be Nicole, and managed to save it, once from an aerial attack from Robotnik, and then from Scourge the Hedgehog and his Suppression Squad. It also assisted the Freedom Fighters and Team Mario on their assault over the Eggdome.

Iron Dominion and illegality
Unfortunately, the Brotherhood of Metallix was taken under the Iron Queen's control and used to cause terror among Mobians. It was saved by the Freedom Fighters, but when Ixis Naugus took over the Acorn Kingdom, he declared the Brotherhood of Metallix as outlaws. For this reason, the Brotherhood returns to their main base, Metallix' castle, and started operating to overthrow him. Upon the Metallix Spies went across the Lost Hex and saw Zavok's abilities, the Metallix Scientists use his biodata to create a Metallix replica of him, replica that helped thwarting Naugus' plan to enslave the Council of Acorn.

While at it, they also helped Team Mario in their quest to defeat Robotnik and save Mecha Sally. Thanks to a virus created by Grimer, Shard managed to turn Orbot and Cubot into the Brotherhood's spies. They then revealed Robotnik's plan to control the Dark Star. When Metallix kills Eggman, the Brotherhood of Metallix launches an all out attack over Knothole to overthrow Naugus, a successful attack, that led with the Brotherhood controlling Knothole for a brief period of time, period that ended with the Brotherhood giving control to King Sonic.