Dragonball Comedy
Biography
Nappa was Vegeta's travelling companion until Vegeta killed him because he lost to Goku. Nappa is clearly physically the strongest saiyan that the z crew encountered in the series but because of his lack of brains, he was no match for Vegeta.
Nappa was so impatient for battle that he went off and destroyed a city and a few harrier jets. Nappa single handedly took on the entire z crew (minus Goku). Nappa eventually killed off Tien, Chiaotzu and Piccolo.
The Alternative Theory
Vegeta being the nice guy that he is didnt actually kill Nappa but sent him into New York without any knowledge of who he is. Nappa aimlessly wondered around New York participating in street fights and exhibition matches. Along the way he met up with this guy called Teddy "the Bear" Turner. There he offered Nappa the chance to join his wrestling organisation.
Nappa was last seen with very bad speech skills wrestling under the name "Goldberg". Nappa's future is currently up in the air after rival wrestling organisation owner Vinnie "The Billionaire" McMahonaman bought out Teddy Turners company.