Between 2012 and 2015, David played Martin Moone in Moone Boy, an Irish sitcom on Sky One. In the series, which is set in the early 1990s, he had an imaginary friend called Seán; he is the youngest child of a family living in rural Boyle, County Roscommon. Martin, aided by his imaginary friend, has a unique perspective on life. His imagination comes into play both in his childish drawings, which come alive through animation, and in the ridiculous schemes he comes up with, against Seán's better judgement. With Seán's help, Martin negotiates life as the youngest in a chaotic, scatter-brained Irish family.
