Trunks is about 17 when we first see him. He is Vegeta and Bulmas' son. He goes back 20 years into the past so he can give Goku a heart medicine. Before he meets Goku, he meets Frieza and his Father, King Cold. He first has to go and fight Friezas' henchmen. He easily destroys them by cutting them all in half with his sword. Then he challenges Frieza. Frieza ends up being sliced in half as well. King Cold is surprised by his sons death but pretends he didn't care. He tells trunks that he is not like his son and would like it if Trunks would join forces with him. Trunks refuses the offer and in the end, ends up killing King Cold as well.... And that my friend......is where the story begins...
Trunks' Bio