The son of Bulma and Vegeta, Mirai (Future) Trunks was born into a world where the androids of Dr. Gero devastated the planet. Each of the Z Fighters died one by one because Son Goku was not there to assist them, after suffering a heart attack contracted from another planet. In the end, Son Gohan and Trunks were the only two left. While Son Gohan managed to train Trunks well, Gohan knew that Trunks was the last hope for the planet, and so decided to face the androids without Trunks, but suffered a mortal blow. Trunks, seeing his father, brother, and mentor, dead, is enraged and finally turns Super Saiyajin, though he's still no match for the Androids. Bulma creates a time machine for him and a cure for Goku's heart disease, and sends Trunks back in time to save Goku. Trunks is the main factor of whether the world would turn into a ruin.Chibi Trunks is born in a peaceful world. He's nothing like his future counterpart, for he is a brat, unlike the calm, passive, Mirai no Trunks. He and his best friend, Son Goten, are nearly equal in power; these two little warriors are even greater when fused as Gotenks. Chibi Trunks never really reaches the power that Mirai no Trunks did, since his timeline was a peaceful one. After training in the Spirit and Time Room, Mirai no Trunks reaches USSJ Level. With his new strength, he went back to the future to defeat Android 17, 18, and Cell.