Goku in the Super Saiyan 2 state.

Super Saiyan 2 is the next stage in the line of Super Saiyan transformations following the original. The form is triggered by extreme rage or extreme stress, be it physical or mental. First achieved by Gohan  during his fight against Cell, the form has sense been achieved by other Saiyans including Goku, and Vegeta who gained it by alternative means. The transformation has been used in two of the Dragon Ball Z Movies by Goku, his fight against Majin Vegeta, for a brief stint against Majin Buu before moving on to Super Saiyan 3 and various other battles. Succeeded by Super Saiyan 3, this transformation is the second main stage in the line of Saiyan Transformations.

Super Saiyan 2 Vegeta.