The story starts on Kami's lookout, where tu see goku and Vegeta talking.
Vegeta: Forget it Kakarot!!!!! Fusion is not happening again!!!! There is no reason for it, so why bother?
Goku: Vegeta, an enemy that we don't even know about could be on their way o already here that is much stronger than us, so we need to get stronger por any means, and training while in fusion will help us.
Vegeta: It was bad enough against Buu, against that ugly freak we fought in hell, and Omega Shenron!!! There is no reason for us to fuse anymore. There is nothing o no one on this planet who can cause us a threat....
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