Super Dragon Ball Heroes S01E05 - The Mightiest Warrior! Super Saiyan 4 Vegito!!

Cumber and Goku's battle breaks the seal around the Prison Planet, while Fu is enraged to discover that his laboratory has been destroyed. Cumber defeats Super Saiyan God Goku and knocks him unconscious. Just before Cumber can kill Goku, Xeno Goku and Xeno Vegeta arrive as Super Saiyan 4s and save Goku. They challenge Cumber, who transforms into Super Saiyan 3, so Xeno Vegeta suggests that he and Xeno Goku use Potara fusion. They put on the earrings and fuse into Xeno Vegito. Xeno Vegito battles Cumber and manages to subdue him using a Kamehameha, before separating back into Xeno Goku and Xeno Vegeta. The resulting explosion breaks the seal completely. Fu returns, now furious over the destruction of his lab, and attacks Xeno Goku and Xeno Vegeta, who manage to block the attack. They then charge at Fu.