Saiyan's Z,Y and X came to earth under Frezia's past orders. when they got there Z ran into Tien and Yamcha and killed them. Not sensing there ki, the rest of the Z fighters came to the spot where Saiyan Z was. Goku was the first to fight and atacked Saiyan X, who almost killed Z when he fired a Super X Beam at Goku who dodged it. Then Vegeta came and atacked Saiyan's Y and Z befor being killed by Z's Electric Punisher. Saiyan Z looks around and sees Gotrunkten, the potara fusion between Goten and Trunks atacking and defeting Saiyan Y. He then kills Gohan which enrages Gotrunkten who atacks him