Mortensen plays Ben, A father of six children, whose wife suffers from mental illness and Ben thought it would be good for her and the kids to live out in the wild, living off the land and tossing the rules of our society out the window. However, Ben's wife did not get better. Captain Fantastic mostly focuses on the children. On a road trip towards their mother's funeral, they get a culture clash with the rest of the world. It lays out all the info for the question of weather these kids were raised right or raise wrong. Captain Fantastic starts off showing you the children's lifestyle, were organic met growing and hunting your own food and made their own clothes and were home schooled. Then they come into society where everyone looks at them as if they are freaks, but why is it weird that these kids don't know the name brand of sneakers? The look on their faces when they experienced Street Fighter for the first time makes sense when your not use to such things. Besides, it's a shame on our Society that an 8 year old can comprehend the Bill of Rights better than those older than her. Watching these kids tackle the woods than watching them adapt to society was a bit of an eye opener. Some times the movie punches you in the gut, like when the talk about religious "organizations" and how Fat everyone in the city seems to be, but the blow is softer cause it's coming from children. But Captain Fantastic is not all one sided, detailing some down qualities of living in the wild , like the eldest son's overzealous first encounter with the opposite sex or the fact that It was the parents choice to live out in the woods, not the child's. Mortensen played the part well of a man who sometimes got too clouded by his beliefs of doing the right thing by his family and who sometimes went to far to prove a point. Also like Frank Langella's character, the father who just lost his daughter and blames his son-in-law. It's was good cause you really know people like the character he plays. Steve Zahn and Kathryn Hahn were also terrific in the movie playing yin to Ben's yang, as parents who don't fully see eye to eye with what he's doing. Overall, everyone has a upbringing different from everyone else and Captain Fantastic takes that statement to a different level, but at it's core, he's just a parent who loves his children and is trying to do the best he can in a difficult time. This theme radiates from Mortensen and the rest of the cast, which is what makes it so Fantastic.