Ultra-Powered Super Saiyan 4

Ultra-Powered Super Saiyan 4 (ウルトラパワー超サイヤ人 Urutorapawā Sūpā Saiya-jin) is powered-up state of Full-Powered Super Saiyan 4 after absorbing a Spirit Bomb (or it's variants).

Appearance
While in this state; the user's hair becomes more solid and his eyes become more stern. When Goku: GT was in this form - he had a yellow aura with black electricity while Vegito had a blue and yellow aura. Similar to the Full-Powered Super Saiyan state; the user is constantly surrounded by an aura. The user's fur also seems to become more lighter in colour, and Goku's and Vegito's skin-tone becomes a lighter colour.

Power and usage
This state sent Goku's power through the roof as he was able to knock down Baby with a single punch and Vegito was able to shatter Super 17's Perfect Barrier. However, Goku and Vegito don't maintain the form for a long and as such the full extent of their power is left up to speculation.

However, as a result of using this form Goku was able to retain the power it granted but was unable to re-enter this form. After Vegito separated Vegeta's base form power was on power with Goku's Potential Unleashed state while Goku's Super Saiyan 4 form surpassed Super 17's base form power.