Lewis played Charlie Raphael in the 2005 drama film Asylum, the son of characters played by Hugh Bonneville and Natasha Richardson. The Washington Times' Gary Arnold observed that Lewis portrayed the only sympathetic person in the film. For the film, Lewis had to perform a stunt involving the near drowning of his character. While they used a nine-year-old stunt child for the wider shots, the close-ups used Lewis and his co-star Rhydian Jones. Lewis' mother was constantly nearby during its filming.
Lewis appeared as Matthew Couillard, a real-life person who survived a deadly snowstorm while skiing in Turkey with his father, in a 2006 episode of the documentary television series I Shouldn't Be Alive. In 2008, Lewis worked on the dramatised documentary The Shooting of Thomas Hurndall, which depicted the real-life story of a young peace Activist who is killed in Israel. In 2012, Lewis appeared in the short film The End, which won Best Film at HollyShorts Film Festival. It also won the Award of Merit at the Lucerne International Film Festival.
