Dragon Ball: Come back in "One Piece" ,Goku and Luffy PT.1
Goku, Krillin, and Bulma are flying in a submarine airplane over the ocean in search of the dragonball that's in an underwater cave. All of a sudden, a huge hurricane that's glowing light in it appears out of nowhere. They tried to dodge the hurricane, but they were suck into it. In the hurricane , the glass of the submarine airplane got broken, which Goku, Krillin, and Bulma to get blow out of the vehicle. Goku was about to call his kinto-un(flying nimbus), but he gets K.O in the back of his head by a tree in the hurricane. Both Krillin and Bulma yell out for Goku, but they pass out due to all the spinning around in the hurricane. Then, the light that was in the hurricane got very, very bright that all you could see is white.
Goku wakes up and finds himself in a desert while he's rubbing his head. While he's rubbing head, he hears loud shout coming from a distant. Goku calls for flying nimbus so he can fly over there to see what was it. But, nimbus didn't appear even after calling for it a dozen times. Then, Goku starts to think that maybe nimbus is mad at him or something. While he was thinking about nimbus, Goku finally realize that both Krillin and Bulma are missing. So Goku starts to run in the direction where he hear that loud shout thinking that maybe Krillin and Bulma are over there. But when Goku reach at the spot where he hear the loud shout, he finds a hand in the sand. When Goku puts the hand out, we see a beat up Luffy cover with sand and says "Thank you for putting me out of there, but what's a kid your age doing out here?" Goku says "I'm looking for my friends, have you seen them?" Luffy says "No, and by the way my name is…" Then, Luffy falls unconscious leaving Goku with many questions in his head.