Prologue: Luffy met up with Goku after the Strawhat's dropped anchor at an island with one small house on it, the words "Kame House" painted on the front. After meeting the Pirate captain and having a conversation with his new friend, Goku eagerly asked to spar with Luffy to which Strawhat happily accepted. "Let's go to a different place" Goku asked of Luffy due to the Kame house being right next to them and would be in danger if they fought. Goku loudly called out for his nimbus and to the Strawhat's amazement a yellow cloud flew down and appeared, the rest of the Strawhat crew wondered to themselves if this was Skypiean technology and when asked by Nami, Goku was confused.
Goku hopped on and so did Luffy suddenly, proving his innocent nature. The two flew off to where the battle would take place, past the coast where Grandpa Gohan's house resided and onto a wasteland, the perfect site for two destructive forces to battle.
As Goku took a fighting stance, Luffy ran at the Saiyan before stretching his arm back. "Gomu Gomu no Pistol!" he shouted as the stretched arm snapped back towards Goku who dodged the attack and rushed towards Luffy.