Spoiler-Safe Summary

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Buu threatens the world as Piccolo strategizes to buy time for Gotenks and others to prepare, resulting in a devastating attack that leaves few survivors on the surface.

Full Plot Summary

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Buu demands to fight Gotenks, but Piccolo knows that the boys aren't ready. To buy time, he tells Buu that he can spend a day killing the rest of the people on earth. Buu starts walking around the edge of the lookout, and Piccolo uses this time to tell Krillin to wake up the boys and get them into the Hyperbolic Time Chamber to train. Buu completes his walk, and raises up his arm. Millions of energy blasts start flying out of his hand down to earth, and they kill virtually everyone left. After this Human Extinction Attack is finished, only Hercule, the dog Bee, Tien, and Chiaotzu remain on the surface, as well as the people on the lookout. Piccolo asks for Super Buu to wait for one hour, and Videl agrees. Buu complies, because Videl is the daughter of Hercule.