From the introduction: Welcome Jumper, to the world of Dragonball Z. This is a vast cosmos of battle filled with incredibly powerful beings. A Universe populated by fighters capable of destroying planets and Magicians depopulating galaxies. Yes, this is a dangerous place, but you get to enter here before things really start going crazy. That of course being October 1st Age 761, 11 Days before Raditz lands on Earth kicking off the events of the series.