Trunks is the son of Vegeta and Bulma. In the future, him and Gohan are the only survivors of the Android's attack. His mother, Bulma, builds him a time machine which he uses to go back in time. When he first appears from the future nobody knew he was Vegeta and Bulma's son except for Goku and Piccolo. (He told Goku and Piccolo over heard). He is very powerful (almost as powerful as Goku at that time), and defeats Freeza and King Cold before Goku arrives back on Earth. He then helps with fighting the Androids and Cell, then travels back to the future. Back in his time, he is able to easily defeat the Androids because of the training he got with Vegeta in the hyperbolic time chamber (which was destroyed in his future time).