Firefly (TV series)
Jayne Cobb, played by Adam Baldwin, is the hired muscle. He joined the crew for mercenary reasons. He is often the "main gun" for jobs and is someone that can be counted on in a fight. He thinks he is the smartest guy in space but he is just the opposite. As Whedon says several times, he is the person that will ask the questions that no one else wants to talk about.