Dark Sonic

Dark Sonic (ダーク・ソニック, Dāku Sonikku ?), also known as Dark Super Sonic, is Sonic's darker and angrier form. His first and only appearance was in the 67th episode of the TV show Sonic X when he sees Cosmo scared and Chris is injured by Black Narcissus of the Metarex. The multitude of Fake Chaos Emeralds and Sonic's intense anger allowed him to acheive this state. While in this state, Sonic shows his fury by destroying the two prototype Metarex that Black Narcissus pits against him in order to test his strength and speed.