As your battle against Goku and Vegeta starts getting intense, they flee away. You watch around the battlefield as overall environment is destroyed. After an hour you hear an instant transmission sound infront of you, you looked up and see an unknown warrior. You said to them

"Who do you think you are?"

They smirked as they get in a battle stance, preparing to battle. They charged a huge wave of energy in only a few seconds. Which shocked you with how much energy they have.

"Hmph! We are Gogeta! Goku and Vegeta have merged together to take you down!"