The Boy From the Future (未来から来た少年, Mirai kara Kita Shōnen; lit. "The Boy From the Future") is the three hundred thirty-fourth chapter of the Dragon Ball manga. This chapter's anime counterpart is the first half of the episode "Mystery Revealed."
The cover features Bulma driving a Fiat which has the number "13" on the door.
Surprised that Goku does not recognize Future Trunks, Bulma tells him that the boy knew exactly where and when he would arrive on Earth. Goku thinks this is strange, and asks who defeated Frieza, thinking that it was either Piccolo or Vegeta. When Piccolo tells him that the boy became a Super Saiyan and defeated Frieza, Goku is excited, and says that he did not know there were other Saiyans. Vegeta responds that there are not, but Goku does not seem very concerned with the issue. Future Trunks asks Goku if they can talk in private. Yamcha asks what could be so secret, but Goku agrees to Future Trunks' request.
Once they are far enough from the others, Goku thanks Future Trunks for defeating Frieza. Future Trunks says that Goku was supposed to do it, but there that he stepped in since Goku was still three hours away. Goku then reveals to Future Trunks that he has learned Instant Transmission from the inhabitants of Yardrat. Future Trunks is upset that he changed history for no reason, and the mention of this puzzles Goku. Future Trunks then asks Goku if he can become a Super Saiyan at will. When Goku says he can,Future Trunks asks him to do it, and Goku complies. The Z Fighters marvel at Goku's ki, and then Future Trunks becomes a Super Saiyan as well. Trunks then unexpectedly attacks Goku with his sword, but stops just short. Goku, however, does not even attempt to dodge, saying that he could not feel any malice behind the blow.
Future Trunks grins, then tells Goku that he will not stop this time. He attacks again, and Goku stops a flurry of sword blows with just his finger. Satisfied, Future Trunks reverts to his base form and says that Goku is even greater than the stories he heard. Tien, Yamcha, and Vegeta are visibly shocked by what they have seen. After swearing Goku to secrecy, Future Trunks then tells him that he has come from 20 years in the future, and reveals his name and the fact that he is Vegeta's son. The last revelation in particular leaves Goku shocked.