Spoiler-Safe Summary

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Gohan announces his participation in a major martial arts tournament, motivating friends and family to enter as well, while the original fighters prepare for upcoming challenges.

Full Plot Summary

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After preventing a plane crash (flight 336) in Satan City as the Great Saiyaman, Gohan tells Bulma, Trunks, and Vegeta that he'll be participating in the World Martial Arts Tournament. After Vegeta says that he, too, will enter, Goku suddenly speaks up and says that he will be allowed to come back for one day to compete. Excited, Gohan flies off to tell Krillin the good news. Along the way he is mistaken as an actor on a movie set making a film about Saiyaman. Krillin and his wife, Android 18, each decide to enter as well. Even Piccolo says that he'll participate. He and Goten begin training.