Dark Sonic

"All right then! Let's test 'em out!"

- Dark Sonic

Dark Sonic (ダーク・ソニック), 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.

Powers and Abilities
Sonic achieved this form when his intense rage was manifested by the multitude of Fake Chaos Emeralds that surrounded him. He got his rage by seeing Chris hurt and unconscious, and Cosmo so terrified. 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 also saying if Sonic stays like that, he'll be angry all the time like Shadow the Hedgehog.

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, but darker like dark-blue.

Appearance and Colors
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. He demonstrates incredible speed, as he tears through a robot multiple times, simply by dashing through it, while appearing only as a blur (though this could just be him ripping through it with his fists). He also has super strength as he makes dents in metal, and also caves in a robot's face with one punch (it's unknown what kind of metal the robot was made of). During the battle with the Metarex, he disappeared several times in front of an enemy and reappeared right behind them. He was calmed down by Dr. Eggman.

Personality
Dark Sonic seems to relish the prospect of destroying the two prototype Metarex, as shown by his devilish grin, mad cackle, and exaggerated frown. Unlike the Super Sonic from Sonic the Comic, in this form Sonic can control himself and recognize whom he should attack and whom he should not.

Trivia

 * This transformation does not have an official name. It is most commonly called "Dark Sonic", but some fans also use the name "Dark Super Sonic".
 * Right when Sonic turns Dark, his voice seems to get a bit lower.
 * Dark Sonic and Darkspine Sonic are similar in that they are both super transformations that were provoked by negative emotions and they look similar.
 * Although Eggman said that he has "never seen you [Sonic] this worked up before", he did not seem to be surprised by or afraid of the transformation.
 * Sonic's black palette swap in Super Smash Bros. Brawl bears a strong resemblance of Dark Sonic in mid-transformation.
 * When Dark Sonic shows his face for the first time, it sounds like the Sonic X theme for Shadow the Hedgehog plays shortly before Dark Sonic takes off into battle.
 * Dark Sonic has almost the same color scheme as Sonic the Werehog.