Dragon Ball Z, Season 1

Vegeta:
Once we force Kakarot's friends to tell us how to find the dragonballs, we'll eliminate them, along with anyone else who tries to stand in our way.

Nappa:
And then we can wish Raditz back to life.

Vegeta:
No, that would be a wasted wish. Raditz was a weakling and a fool. Any Saiyan who could be defeated so easily doesn't deserve to live.

Nappa:
Hmmm....

Vegeta:
Actually, Nappa, I have something far more grand in mind. Now tell me, how does the idea of eternal life sound to you?

Nappa:
What? Living forever? That sounds great! Yeah, and if we can't die, that means no one'll ever be able to defeat us. So what the heck would we need Raditz for?

Vegeta:
Yes. What for, indeed. We'll be the greatest fighters in the universe. And we will ascend to our rightful place among the Saiyan warriors of legend.

Nappa:
Do you mean...

Vegeta:
That's right Nappa. That's exactly what I mean. We will become Super Saiyans.

Nappa:
Now I definitely like the sound of that.