If you recall, Alejandro González Iñárritu's The Revenant, starring Leonardo DiCaprio at legendary explorer Hugh Glass, is filmed completely with natural light. That's quite a feat, but if they're going for a realistic look Glass' fight to survive in the unchartered American wilderness, it's an absolutely stunning way to go about it.
After he's attacked by a bear (which is depicted in the trailer), Glass is left for dead. Surviving unimabinable grief and betrayal by his confidant John Fitzgerald (Tom Hardy), only love for his family and determination to survive pushes him forward against a vicious winter to survive and find redemption.
The cast includes DiCaprio, Hardy, Will Poulter, Domhnall Gleeson, Paul Anderson and Lukas Haas.
In theaters Christmas Day.