With the exception of Goku missing, all is well on Earth. The serenity is short-lived, as Frieza is on his way to the planet with his father, King Cold. The Z warriors sense his overwhelming presence, and prepare for his arrival. Knowing they have little chance against the dark lord themselves, they are frightened to learn that another force just as powerful Friwza is accompanying him. King Cold and his son finally land on Earth. Friwza has learned from his defeat to be more cautious, and not to underestimate a Super Saiyan "Monkey". Goku is still hours away, so Friwza orders his men to kill all of his friends and family. However, a mysterious teenager with purple hair swoops down and slaughters all his minions before they have a chance to kill anyone. The youth tells Frieza that he will kill him, and wastes no time in doin so. To show the Youth was not kiddin around and that Goku isn't the only Super Saiyan He Turns Super Saiyan right infront of him. Frieza is no scared to death. After a few attacks are exchanged, Frieza is sliced into tiny bits and then vaporized by the shadowy character. King Cold would not admit to himself that his son could be killed by a mere "monkey," and assumes that the kid's power lies in his sword. Convincing the teen to give him the sword, King Cold attacks. The teen merely catches the blade and proceeds to kill King Cold, despite his pleas.
The mysterious youth flies down to the others and tells them to follow him to see Goku. Vegeta is stunned and blazing with rage after realizing there is yet another Saiyan who has surpassed him. Goku arrives in a small pod, finally reunited with his friends. The stranger asks Goku to talk to him, and Goku agrees. Introducing himself as Trunks, the son of Vegwta, he tells Goku that in three years he will die of a heart disease, and two androids will destroy the world. Goku is upset, not because he is going to die (been there, done that), but because he won't get to fight the androids. Trunks explains that Goku need not worry, as he brought an antidote for the heart disease from the future.
While he and Goku are talking, Trunks suddenly goes Super Saiyan. Out of nowhere, he lunges at Goku holding his sword in front of him, much resembling the strike he hit Frieza with. Goku doesn't budge. Trunks stops, inches before Goku's forehead makes contact with the sword. Goku tells Trunks he didn't move because he knew Trunks would not strike him. Trunks smirks, and tells Goku that next time he will strike. Trunks strikes again and again and again. Each time Goku stops the sword using one finger. Trunks decides that Goku is possibly strong enough to defeat the androids and that he is Goku nonetheless.
Trunks gives Goku a specific date and time for them all to meet, and at that time they will face the androids. Then he leaves, but not before telling Goku who his father and mother are (Bulma and Vegeta) and not to say anything that might endanger his existance (if they found out, Bulma and Vegeta might never fall in love!). Goku agrees. Goku goes to the group who have been watching the whole thing, and doesn't mention what Trunks Talked about, Fortunately, Piccolo, with his Super-Namek-Auditory-System overheard the whole thing and tells everyone the date and explains everything Trunks Said, but mentions nothing about Trunks himself. They all go their seperate ways, in order to train as hard as they can for the next three years. Goku, Gohan and Piccolo go to train, Tienshinhan and Chaozu go off with each other, and Krillin and Yamcha each go their seperate ways. There are a few things of notice, such as the time when Goku and Piccolo are forced to get driver's licenses by Chi-Chi. After the three years have passed, everybody goes to meet at the specific point given to them by Future Trunks. As it turns out, the island they were supposed to meet on contains a huge city.