Alter-Sanic is an alternate version of Sanic that comes from another dimension. Alter-Sanic is a punk rocker and goes at only 99.9999999999999999999999999999999999999999999999999999999999999999999% of Sanic's speed.
There is also a Super version of Alter-Sanic. Instead of turning yellow like Sanic, Alter's turns red, and he gains the power to shoot Shoop da Whoops from his hand.