There, he would befriend its populace and devote himself to protecting it and all life from evil. Born on the planet Vegeta to a race of powerful alien warriors, Kakarot was sent to Earth by his father Bardock upon discovering that the evil alien warlord Frieza’s went to wipe out their civilization. Son Goku, born Kakarot, is the main protagonist of the Dragon Ball franchise. ~ Goku promises to save Gohan if he can't save earth. I'm not sure about the earth but I can save you.
~ Goku talking to his friends about saving the earth. ~ Goku to Android 17 in Funimation's Dragon Ball Super dub. But I can't bear the thought of innocent lives getting wiped out just cause I wanna fight the best.
The fact is, it's cause I'm usually trying to challenge the strongest warriors I can find.
No see, I don't think like I'm saving the world.