This character exists primarily or exclusively within the Pre-Super Genesis Wave continuity. Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
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The Brass Knuckles are a robotic variety of Echidnas from a possible future version of Mobius.
Given their name, it is likely that the Brass Knuckles are intended to be descendants of Knuckles the Echidna.
The Freedom Fighters of the Galaxy and their enemies, including the Brass Knuckles, currently hold the fifteenth-longest non-appearance gap in the main series, though it is unknown if they will return at all (StH: #104-#207)
Their name derives from the weapon known as Brass Knuckles, which have been made illegal in a wide range of the U.S.