Nappa is a powerful Saiyan warrior best known for arriving on Earth alongside Vegeta to hunt for the Dragon Balls. He's been Vegeta's right-hand since childhood, and even by Saiyan standards, he's got a notably brutal streak. During his time on Earth, Nappa managed to take down Tenshinhan and Chaozu—killing them in the process—and defeated Piccolo, showcasing his raw strength. Things fell apart when Goku showed up, fresh from training with North Kaio and vastly stronger than before. Nappa couldn't keep up, and when it became clear he was outmatched, Vegeta told him to stand down. That decision sealed his fate: Vegeta executed him right there, unwilling to keep around a fighter who'd proven weak against Goku.
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