Super Saiyan 4 first appeared in Dragon Ball GT in 1997 as Goku's most primal transformation, restoring his tail and giving him red fur, black hair, and red-rimmed eyes unlike the golden forms from Dragon Ball Z. The form later appeared on Vegeta and their fusion Gogeta, cementing its place as GT's most iconic creation. Though GT sits outside the main canon timeline, the transformation remains hugely popular in games, fan art, and edits, where its roar and aura sounds signal an extreme power-up.