Super Link or Mega Link is the transformation of Link. Link must get very angry, and that makes his power slowly grow and grow, until finally he snaps and then he gets very buff, his clothes turn into a Darker Shade and his hair gets longer.
Link had gotten very angry when he saw an alternate future where Zelda and the rest of Hyrule was destroyed. He had then went through the Metamorphisis. His power skyrocketted and he had gotten a darker shade of clothes, finally he had transformed