Non Disney Villains War
Taking the Technodrome
Dr. Robotnik captures and roboticizes the actual Sonic the Hedgehog to create this incarnation of Metal Sonic. During the battle in which Robotnik tries to seize the Technodrome, Snively controls Metal Sonic from afar and uses him to fight the Shredder's Foot Clan robots. Metal Sonic even takes down Bebop, one of the Shredder's top lieutenants.
Video Game Villains War
Called Into Battle
After a tremendous failure in fighting the monster, Tabuu, Dr. Eggman calls in Metal Sonic to defeat the monster for him. Metal Sonic smashes through Tabuu's wings, ultimately charging right through the villain and destroying him. However, the impact of the blow weakens the integrity of Metal Sonic's control frame cause it to become Neo Metal Sonic.
A Cruel Trick
Metal Sonic disguises himself as Dr. Eggman and approaches Ganondorf with a proposition: he will destroy the massive Commander Spog in order to weaken the alliance of Dr. Nefarious. "Eggman" then proceeds to Spog's lair in the Egg Dragoon to take the giant robot out. He launches a massive drill at Spog, weakening his foe. However, Spog severely damages the Dragoon, pummelling it with heated weights and grenades. As the Dragoon falls to the ground, malfunctioning, "Eggman" finally forces Spog to the ground with one blast of laser fire. With Spog defeated, Metal Sonic reveals his true form and copies Spog's data.
After the real Dr. Eggman defeats Dr. Nefarious, Metal Sonic steps into Nefarious's place, making quick friends with Nefarious's AI assistant, GLaDOS. The two unleash Donkey Kong from his trophy; in addition, they engineer an army of evil Kongs to assist them in their villainous purposes. For more information, see here.
The Robotic Takeover
Metal Sonic makes his move in the middle of a meeting of Ganondorf and his allies. Summoning his chief robotic lieutenants - GlaDOS, Sigma, Lumine, and Courtney Gears - Metal Sonic hacks into the systems of the R.O.B. guards and begins wreaking havoc. When Ganondorf tries to oppose him, Metal Sonic activates a portal of dark magic energy. Ganondorf, caught in the way, is blown to smithereens. As Eggman and the rest of Ganondorf's allies flee, Metal Sonic cackles with robotic glee.