From the Start, I Make Master Roshi My Grandfather and Conquer the World

I transmigrate into Dragon Ball and become Goku’s senior fellow disciple. I know The Saiyans will arrive, Earth will be destroyed, and many people will die. In this life I assemble Earth’s strongest lineup ahead of time. Goku, Krillin, Tien Shinhan, Piccolo, Chiaotzu. So this time It won’t be the universe invading Earth. Instead, Earth’s martial artists will strike back at the universe!