Omega Shenron's power has far surpassed Goku's. Goku is no longer a match for him. Desperate, Goku grabs Omega Shenron. He begins to self-destruct, but Vegeta arrives and tells him not to. He knows firsthand that self-destruction doesn't work. Bulma arrives with the Blutz Wave Generator, and she blasts Vegeta with it. Vegeta transforms into an Oozaru, and it seems like he has lost control of himself, but he quickly becomes conscious of his actions. He then transforms into a Super Saiyan 4, but even teaming up with Goku won't be enough to stop Omega Shenron. He suggests that he and Goku fuse together.
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