6. Tim Kang
Being the captain is hard. You deal with stress daily, and frequently encounter disasters that require you to think quickly. Since 2008, Tim Kang has been appearing in The Mentalist as the cool-headed guy in the group, who remains calm even when face-to-face with killers, dealing with personal threat with little more than a blink. The other role for which he is perhaps best known is as En-Joo in Rambo (also 2008), wherein he plays a brutal, cold-hearted mercenary. Albeit, working for the good guys. With these two roles alone, Tim Kang has proven he could easily carry a role with the weight of a captain on Star Trek. When the character he plays is faced with adversity, he could remain calm and collected, but when it becomes clear there's no other choice, he could lead his men in their fight.