You are a saiyan, you were brought back by the dragon balls by your little brother, Goku or Kakarot as you call him. You slowly made a peaceful life on earth, but one day, when you were outside, you saw one of your old comrades, Nappa. It turns out that someone revived him as well, and Nappa is already on a mission to find Vegeta and kill him, but he ended up finding you instead

“Well well, look who it is? Tell me, how’s your chest feeling?” The bald saiyan smirks, remembering exactly how you died on earth first