The youngster was Trunks from the future, or really, Trunks from another parallel universe. In his world, all the warriors were dead and what was left was apocalyptic despair.
There, martial arts had declined completely, especially after Gohan, who had been training on his own, died at the hands of the Androids, so there was no expert on Earth who could restrain those two demons. All this time, he could only fumble on his own while training, so his progress was very slow. Although he also became a Super Saiyan, he had never been an equal opponent to the Androids.
Often, his mother would sigh with emotion: if Goku was still alive, the Androids would not be so rampant.
Trunks didn’t know what kind of person Goku was, to the point that his mother always talked about him, and why she could not forget him, because he had never seen Goku. By the time he was born, Goku had already died of a heart disease. But there should be something special about the person that mother trusted so strongly.
This was the destination of his trip. According to his mother, as long as Trunks could look for Goku here and give him the special medicine for viral heart disease, and then tell him what was going to happen in the future, the future may turn out for the better.
Trunks was flying swiftly with a big sword on his back. Seeing the peaceful and happy atmosphere here, he couldn’t help but compare it to the miserable and despairing world in his memory. Seeing the comparison, his handsome face showed sadness.
“I have to find Mr. Goku as soon as possible and tell him about the disaster in the future! The tragedy absolutely cannot be allowed to happen again…”
This thought kept urging him on, but he didn’t know that this was not the Earth that he knew.
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Does that means trunks’s time machine does not travel through time but travel across dimension instead?