This is the last form of super saiyan in Dragonball Z. The transformation is almost the same as a Saiyan or Super Saiyan. It just isn't that easy to get in this form. This Transformation also needs a lot of power and also takes a lot of energy to remain in this form or else you will change back into a normal Super Saiyan. The most recognizable things are the hair, which is way longer than a normal Super Saiyan or a Super Saiyan 2, there is a glow and again the eyes turn green but have pupils now. Every thing improved, power, speed, sight! The Saiyan also looks a lot meaner because the eyebrows are gone and his forehead looks bigger. The most complete form because everything is improved.
The ones who achieved this goal are: Goku