By Eric Kohn | Eric Kohn July 18, 2011 at 5:15AM
When I saw "Another Earth" at Sundance earlier this year, I was caught off guard by the presence of William Mapother. A cousin of Tom Cruise, Mapother recently played the eerie "Other" Ethan on ABC's "Lost," showing up in the first season as a mysterious presence among the plane crash survivors and slowly taking on a more complex dimension over the course of the show (even long after his character was killed off). Although I wrote in my review that Mapother did powerful work in "Another Earth," which opens this week, it's mostly the material that deepens his performance. I don't really feel for the guy as a frustrated widower; he seems like a better fit for the Paul Giamatti school of uncomfortable anti-heroes, as the embedded clip below hopefully demonstrates.