Asa Butterfield defies gravity and age in 'Ender's Game'

Young actor Asa Butterfield's difficult physical role was complicated by how quickly he had to mature in the film.It's not as if Ender Wiggin has all that much riding on his shoulders. He just must single-handedly save the planet in a war against aliens and then become a moral compass for mankind. All before he's old enough to have a beer.