During a late-night train ride, memories resurface for a writer, bringing him face-to-face with the painful past surrounding his mother's admission to a mental hospital years ago.
| Actor | Role |
|---|---|
| HHuw YnyrHogyn | Hogyn |
 Annes ElwyJini / Usherette | Jini / Usherette |
| DDylan Morrison-JonesHogyn Ifanc | Hogyn Ifanc |
| EElin PritchardMam / Brenhines y Llyn Du | Mam / Brenhines y Llyn Du |
| JJames TaylorHuw | Huw |
| RRobyn Lyn EvansEm | Em |
| LLeah-Marian JonesDynes Glên / Brenhines yr Wyddfa | Dynes Glên / Brenhines yr Wyddfa |
| EEleri GwilymAngharad | Angharad |
| EEmyr Wyn JonesDr Rees / Ynel Wil | Dr Rees / Ynel Wil |
| BBuddug Verona JamesNain | Nain |
 Rhys MeirionDewi Siop Gornal | Dewi Siop Gornal |
| SSion GoronwyWil Plisman | Wil Plisman |
 Rhys Parry JonesConvert | Convert |
| PPaul Carey JonesElis Ifas | Elis Ifas |
| SShân CothiGres Ifas | Gres Ifas |
 Dafydd AllenTrain Guard | Train Guard |
| LLevi Tyrell JohnsonAsylum Patient | Asylum Patient |
| LLily Beau ConwayNurse 1950 | Nurse 1950 |
| MMeinir Wyn RobertsVoice of Jini | Voice of Jini |