Lewis began acting at 9 years old, with roles in television series including Heartbeat, A Touch of Frost and Cracker, as well as in the film Girls' Night.
Regular roles in Children's Ward (as Scott Morris for three series) and Adam's Family Tree (as Adam for two series) followed, as well as the lead in the show My Dad's a Boring Nerd.
He went on to appear in the ITV soap opera Emmerdale, where he portrayed the role of Marc Reynolds for three years, making a three episode guest return five years after his initial departure.
After leaving Emmerdale, Lewis performed in Broken Voices at the Tristan Bates Theatre in London.
Other work includes appearances in the television series Dalziel and Pascoe and Respectable, and the film Boy A, and a starring role in the science-fiction series show Torchwood as the young World War I soldier Tommy Brockless.