The Great Ape refers to the transformation into a giant monkey that saiyans can perform. In order for a saiyan to undergo this transformation they must possess a tail while being exposed to Blutz Waves. These are usually given off by a moon of some sort, although in some cases other planets may work as well. The overall power increase experienced by a saiyan in this form is exactly ten times that of their original power level. As far as appearance goes the Great Ape's fur is usually brown. Those who are in the form of Great Ape usually go into a rampage, destroying everything within their path. Although, once in the form, saiyans do retain a hidden sense of their friendship with those close to them, and it is possible for them to come to their senses.