Sonic Werehog is a transformation of the main protagonist, Sonic the Hedgehog, in the Sonic the Hedgehog series, notably featured in 'Sonic Unleashed.' During the night, Sonic transforms into the Werehog, gaining incredible strength and stretchable arms but losing some of his trademark speed. This form allows Sonic to fight powerful enemies and overcome obstacles that his regular form cannot. The Werehog plays a crucial role in the game’s storyline, helping Sonic combat the evil unleashed by Dr. Eggman.