It has been nearly 2 years sense the defeat over the evil Majin Buu, the good Majin Buu now living with Hercule along with Hercule's daughter Videl and little Bee(Buu's dog) at Hercule's estate. Around mid afternoon one day, a few unexpected visitors came through a vortex, one of many that had opened on earth and unknown to the earth's inhabitants, on other planets as well. The two visitors who have come and took to scoping out the city, have, like their partners who took to scoping out the mountains and countryside, come seeking help from Vegeta, who isn't there at the time due to being off on his own, training in order to still one day surpass Goku, though the visitors aren't aware yet, nor are they aware that the other person the are seeking help from, Gohan, is buckled down with finals at school and can't very well leave just yet either. Over in mount pals, Goten and Trunks are playing sparing and training games like they always do and they see a couple of the vortexes open nearby their location. Goten: Do you see that Trunks? What are those things? Trunks: I'm not sure Goten. Maybe we should go check it out. After Trunks gives the word, he and Goten take off to find out what they can about the appearance of the vortexes, not knowing that they are appearing not only there but in other parts of the planet, including West city, where Trunks' mother Bulma, whom is at the time pregnant, lives, along with his grandparents, bulma's mother and father, Dr. and Mrs. Brief.