Is he the star of the new series Westworld? or is Ed Harris?

I'm wondering if he is the star of the new HBO series Westworld or is Ed Harris the lead? I know Ed Harris is more famous but he is the bad guy in it. I'm not sure if Rodrigo's character is a good guy or bad guy? anyone know? I hope this works out for him in america. They treated him like crap in lost, didn't hardly even let him have any screen time until his last episode.