Fusion Reborn! Goku and Vegeta is the fifteenth level in the Special Saga in the video game Dragon Ball Z: Budokai Tenkaichi 3. It is based on the second part of the movie Dragon Ball Z: Fusion Reborn.
After Janemba transforms not even Super Saiyan 3 Goku can beat him. Vegeta then comes to help but is no use. Goku recommends Fusing and Vegeta reluctantly agrees. They become Gogeta and destroy Janemba.
The normal way to win is as Gogeta, but the battle can also be won as Super Saiyan 3 Goku, Base Goku or Vegeta.
Differences from the movie
In the film Fusion Reborn, Vegeta arrives to fight Janemba as a Super Saiyan. However, in Budokai Tenkaichi 3, he arrives in his base form.