Sonic the Werehog

A Werehog is a corrupted transformation Sonic undergoes in Sonic Unleashed. It is caused by Dr. Eggman and a special ray that hits Sonic. Sonic finds out at sundown, he changes into the Werehog. When Dark Gaia awakened, he tried to destroy Chip but Sonic managed to push him out of the way. Dark Gaia outraged, took Sonic's Dark powers away from him. When Professor Pickle explained to Amy Rose darkness is a part of their world, it might be possible that he could change to the Werehog

Abilities
Super Stretch: Sonic has the ability to stretch his arms which is useful to grapple on poles and higher ledges.

Super Strength: This allows sonic to lift sealed doors and heavy metallic objects.

Future Appearances
It is rumoured that the Werehog will appear in a future game of sonic and a rumoured sequel to sonic unleashed.