HomePeople Biography and filmographyGeraint Lewis Biography unavailable on TMDB. Movies (4)TV shows (0) Movies (4) Martha, Jac and SiancoMartha, Jac and Sianco2009 · Sianco S.O.S. Galw Gari Tryfan2008 · Dr. Blethyn, Writer, Story A Mind To Kill1991 · DS Carwyn Phillips O.M.1990 · William TV shows (0) No credits available.