NEW YORK (BTG): Viggo Mortensen is to star in comedy drama Captain Fantastic. The Lord Of The Rings star will play a father-of-six, who teaches his children how to survive in the wilderness - but he struggles to adjust himself when he is forced out of the forests into the real world. Steve Zahn, Katheryn Hahn, Missi Pyle and Erin Moriarty will join Viggo and Frank Langella in the film, to be directed by Matt Ross, reported Entertainment Weekly.