Here's my Star Trek (TOS) purity list: * Kirk is the big risk, big reward leader. * Spock is the logical dude who offers logical solutions to problems but has a volatile personality just below the surface. * McCoy is emotion. He offers emotional responses and solutions to challenges the crew faces. He is an MD. * Scott is the fix-it man. There to overcome the technical challenges of the Enterprise. * The Enterprise, a kick-ass starship that is the envy of the whole fucking galaxy. Put it all in a sci-fi, action-adventure blender and serve generously.