Dark Sonic

Dark Sonic (Dāku Sonikku) is Sonic's darker form. His first 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. Sonic uses his anger to achieve 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.

Appearance and colors


Sonic achieved this form by channeling his rage and anger from seeing Chris passed out, and Cosmo being scared. As such, "Dark Sonic" is completely consumed by it. He quickly destroys both of the machines the Metarex were using to test Sonic and takes a sadistic pleasure in doing so (indicated by his mad cackling and evil grin). Sonic powers down when he is calmed by Doctor Eggman who says Sonic normally acts much better and more positive than this.

The events leading to Sonic's transformation into Dark Sonic are paralleled in Sonic and the Secret Rings, resulting in Sonic becoming the extremely similar Darkspine Sonic.

Theories
thumb|left|300px It is presumed that Sonic also absorbed the energy of the fake Chaos Emeralds he was previously knocked into on the Metarex ship, giving him the power to transform into Dark Sonic. The fake emeralds are later destroyed and Dark Sonic is never seen again, lending credence to the theory. Conversely, this is the only time in the series where Sonic expresses genuine rage, so it is unknown whether or not the Fake Emeralds acted as a catalyst to his transformation or if he accomplished it through pure rage. Another theory is that Sonic absorbed the negative energies of the Chaos Emeralds rather than the usual positive energy (similar to how Chaos became Perfect Chaos due to absorbing the negative energies).

Powers and Abilities
Dark Sonic looks similar to Super Sonic except he has a bluish-black color, a blue aura, and no pupils or eye color when he is at maximum power. It's possible that he also had augmented Chaos Powers, as he disappeared several times in his battle with the Metarex, and reappeared right behind them, but this could also be due to him traveling at lightspeed.

Trivia

 * Dark Sonic is sometimes mistakenly referred to as "Dark Super Sonic".
 * Right when Sonic turns Dark, his voice seems to get a bit lower.
 * Because the form was made by Sonic Team it is possible for Dark Sonic to be in future games.