未来のトランクス

Trunks is the son of Bulma and Vegeta. Half Saiyajin and half human, just like Gohan and Goten. Trunks was surrounded by a scientific environment. Having his mother and grandfather as scientists, he became very intelligent at science. In the future, Trunks was battling the Jinzoningen, but they were too strong, so Bulma had completed a time machine and sent Trunks back to help Goku and Gohan fight.

(Source: Dragon Ball Wiki)