In a Welsh coal mining valley, a young man with a beautiful singing voice is called upon to make the ultimate sacrifice when a pit disaster threatens.
| Actor | Role |
|---|---|
 Paul RobesonDavid Goliath | David Goliath |
 Rachel ThomasMrs. Parry | Mrs. Parry |
 Edward ChapmanDick Parry | Dick Parry |
| SSimon LackEmlyn Parry | Emlyn Parry |
| DDilys ThomasDilys Parry | Dilys Parry |
 Edward RigbyBert | Bert |
| JJanet JohnsonGwen Owen | Gwen Owen |
| DDilys DaviesMrs. Owen | Mrs. Owen |
 Clifford EvansSeth Jones | Seth Jones |
 Allan JeayesMr. Trevor | Mr. Trevor |
 George MerrittMr. Lewis | Mr. Lewis |
| EEdward LexyCommissionaire | Commissionaire |
 John Glyn-JonesMr. Howes - Collector | Mr. Howes - Collector |
 Noel HowlettCompany Clerk | Company Clerk |
| BBen WilliamsWill Morgan | Will Morgan |
| CCharles WilliamsEvans | Evans |
 Ronald WardSir John | Sir John |
| RRoddy HughesLloyd - Miner | Lloyd - Miner |
 Harry TerryMiner | Miner |
| MMike JohnsonCage Operator | Cage Operator |
| EEdward KeyesMinor Role | Minor Role |
 Leslie PhillipsMinor Role | Minor Role |
| GGrant SutherlandMinor Role | Minor Role |
| BBabette WashingtonMinor Role | Minor Role |
| JJack JonesThomas | Thomas |
| GGeorge SpenceMiner The Proud Valley | Miner The Proud Valley |