Sankaku Channel/ssj4

<p>The Super Saiyan 4 (超サイヤ人4 Sūpā Saiyajin 4?) is a form that exclusively appears in Toei's spin-off anime series <a href='http://chan.sankakucomplex.com/wiki/show?title=dragonball_gt'>Dragon Ball GT</a>, and was not part of the original series. Even though Toriyama supervised the production for Dragon Ball GT, he did not design the characters or Super Saiyan 4. The Super Saiyan 4 was designed by Toei artist Katsuyoshi Nakatsuru, and was designed to more closely resemble the Saiyan Ape form which appears early in the written series. As a result, the Super Saiyan 4 design does not resemble the original Super Saiyan design of golden-yellow hair and green eyes. While Toriyama did not design the Super Saiyan 4, he did draw a manga version of Goku as a Super Saiyan 4 for the Dragon Box, a massive media boxset containing all the Dragon Ball movies and episodes ever produced by Toei.<p>
<p>Wanting to expand the Dragon Ball series, Toei created a new series called Dragon Ball GT. As new enemies emerged in the series, Goku searches for a way to ascend what he had originally thought was the last Super Saiyan form. As a result, he went through a process that enabled him to transform into a Super Saiyan 4. The Super Saiyan 4 form is the most advanced Super Saiyan transformation achieved in the anime series, and is widely believed to be only accessible to pure blooded Saiyans; this was discovered when the parasitic Tuffle Baby had infected Vegeta, and Baby Vegeta could not transform to this because Baby was not a Saiyan, making Vegeta's heritage impure.<p>
<p>The Super Saiyan 4 has several unusual characteristics like it only being possible for pure Saiyans to achieve the transformation. Odd visual characteristics can be observed with disappearing articles of clothing after transformation, and the instant aging of Goku from child to adult when he transforms into Super Saiyan 4. It should be noted that the aging can be explained by the form's power. Super Saiyan 4 is strong enough to overpower the red dragon's magic, reverting Goku to his proper age. When compared to the previous Super Saiyan forms, the Super Saiyan 4 also has an unusual appearance. The Super Saiyan 4 does not have yellow hair. Instead the Saiyan retains his original hair color, has a tail, and develops a shade of red "fur" that covers most of the body. Each Saiyan who can utilize the transformation has different tone of red fur and eye color from other Saiyans who can achieve the form. The Super Saiyan 4 form is much more powerful and faster than the previous Super Saiyan transformations. The only two Saiyans known to be able to complete this transformation in the Dragon Ball series are Goku and Vegeta. Their fused form, Gogeta, was also able to achieve Super Saiyan 4, though he was shown having red hair and brown fur.</p>

<p>Source <a href='http://en.wikipedia.org/wiki/Super_Saiyan#Super_Saiyan_4'>wikipedia</a></p>;