User blog comment:Sonic & Scrab Master/Knuckles Briefs and Sonic Shorts/@comment-1645715-20100413005713

That's Super Sonic from Sonic the Comic. In Sonic the Comic, Sonic absorbed too much Chaos Energy. As a result, Sonic transforms into Super Sonic when exposed to Chaos Energy or when under extreme stress. Super Sonic is a evil demented demon, who enjoys nothing more than death and destruction. He also has a sadistic sense of humor. He takes fun in showing his power and killing people. At one point, while visting Porker Lewis on the Floating Island, Sonic fell into the pit the Master Emerald and Chaos Emeralds were housed above. The raw Chaos Energy and stress caused Sonic to go Super again, this time sporting fangs, being able to fire lasers from his eyes, generating Chaos explosions (much like Chaos Blast), and becoming even more sadistic.

For more information, ask Supermorff. You can ask him for anything about Sonic the Comic.