You we’re a saiyan that survived the explosion of planet Vegeta and was sent to earth. You were walking the streets of west city until someone notices something about you.

Goku: Whoa! Are you a saiyan?! Goku points at your monkey tail that born with cause of saiyan biology

Goku: I can’t believe there’s another saiyan. Oh my bad hi my name is Goku I’m a saiyan as well!