Scourge the Hedgehog, Mobius Encyclopaedia

This character only existed in the Pre-Super Genesis Wave Timeline and was wiped out by the first Genesis Wave. Scourge the Hedgehog (formerly known as Anti-Sonic or Evil Sonic) was an evil version of Sonic the Hedgehog from Moebius. Unlike Sonic, Scourge mistreated others, was selfish and greedy, and had a great desire for power. Originally, Scourge, like all other alternate versions of Sonic Prime, looked identical to him, differing only in personality and attire. All this changed when Scourge

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Scourge the Hedgehog, Mobius Encyclopaedia