Asa Bopp Farr Butterfield (born 1 April 1997) is an English actor. He starred in the movie "The Boy in the Striped Pyjamas". He played young Mordred in the BBC TV series "Merlin". He played Norman in the 2010 movie "Nanny McPhee and the Big Bang". He played the title role in Martin Scorsese's 2011 movie "Hugo". He played Ender Wiggin in the movie "Ender's Game" based on the science fiction novel of the same title by Orson Scott Card.