Spoiler-Safe Summary

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Earth's greatest warriors travel through time to Kami's Pendulum Room, gaining insight into past and future events that emphasize the need for intense training before the arrival of formidable Saiyan foes.

Full Plot Summary

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Gohan's real training is about to begin, as Piccolo trains him in the martial arts. On Kami's Lookout, Yamcha, Tien, Krillin and Chiaotzu want to get the same training as Goku did. So, Mr. Popo takes them to the Pendulum Room where the past, present, and future intertwine. Krillin and the others use the room and are sent to Planet Vegeta in the past, facing two powerful Saiyan warriors. After a horrifying battle, the Z Fighters continue their training with more motivation.