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Metal Sonic 3.0 is a character from the Sonic the Hedgehog series. His first appearance was in Sonic Rivals 2. It is Eggman Nega's version of Metal Sonic; the major difference being that 3.0's palette uses black and yellow instead of dark blue. It is frequently confused with Gemerl and great care is necessary to avoid confusion.
Metal Sonic 3.0 appears in this game by the name of Metal Sonic II as an integral part of Team Eggman, the primary nemesis of the game.
Metal Sonic 3.0 is the "main" antagonist of this movie. He plans to destroy Mario and his friends so there will be no one standing in his way of conquering the Earth. He has a new form in this movie known as Metal Overlord DX.
In Metal, Metal Sonic 3.0 appears as a costume to wear. He does not have any changes to gameplay.
Metal Sonic 3.0 is a regular and frequently recurring character throughout the series, having appeared in all four episodes, plus the four Christmas Specials. Unlike his portrayal in Sonic Rivals 2, 3.0 was given a personality, and his rivalry with the original Metal Sonic was expanded upon. Metal Sonic 3.0 is portrayed as an extremely rude, egotistical, and arrogant character who prides himself on being built with the latest technology, considering all outdated machinery to be utterly worthless and insignificant. As such, he has an obsessive rivalry with the original Metal Sonic. Despite suffering countless defeats at the hand of his counterpart numerous times, Metal Sonic 3.0 still believes himself to be the superior model.
In the first three Elements of Power episodes, Metal Sonic 3.0 was an antagonist, but ended up becoming an anti-hero as of the first Christmas Special, and one of the protagonists in the fourth episode. Metal Sonic 3.0's portrayal in the story was inspired by Bass/Forte from the Mega Man series, as they are both clones of another character, have the same egotistical attitude, competitive mentality, and desire to become the strongest among all robots.