Spoiler-Safe Summary

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Goku reveals a fusion technique to merge two fighters into a more powerful being, prompting Goten and Trunks to start learning it amid urgent events involving the return of recently lost allies and ongoing searches for key figures by the Supreme Kai.

Full Plot Summary

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While discussing tactics, Goku reveals that he knows of a method by which two similar-sized people can fuse together into one ultimate being. They decide that Goten and Trunks will learn this new trick, but the only problem is that it will take about a week to learn it, and Goku has less than a day left on Earth. Piccolo decides to teach the boys after Goku is gone. Suddenly, the sky turns black, and they realize that Bulma is calling the dragon. Goku uses Instant Transmission to appear at Capsule Corp., but she has already made one wish. Her wish was to bring back everyone that died today. Goku tells Shenron that they will postpone their second wish, and uses Instant Transmission to take everyone there back to the lookout with him. Meanwhile, Kibito awakens because of the wish, and the Supreme Kai is still searching for Gohan.