This form of Super Saiyan is totally different. Firstly, you must have a tail. Secondly, you must have been able to previously go Super Saiyan and Golden Oozaru. This form looks nothing like the rest. Your kair stays black and your body gets covered in a layer of thick, red fur. Your eyelids and pupils darked and you get a new pair of leather pants? Hmmm. Like the rest your power grows even higher with some of your speed. Vegeta used a machine that Bulma invented to turn saiyans into Super Saiyan 4. He did not take the natural way, like Goku. Although, his power level is as high as Goku's. I am positive that Gohan doesn't go SSJ4. Although there are many pictures of Gohan SSJ4. This is probably the last form of Super Saiyan.