
In 1979, after Margaret Thatcher’s newly‑elected government reneges on its pledge to launch a Welsh‑language television service, protests erupt across Wales. Gwynfor Evans, a determined activist, threatens a hunger strike, vowing to die unless the promise is fulfilled. The film retells this vivid, pivotal episode of modern Welsh history.
Does Y Sŵn have end credit scenes?
No!
Y Sŵn does not have end credit scenes. You can leave when the credits roll.
Explore the complete cast of Y Sŵn, including both lead and supporting actors. Learn who plays each character, discover their past roles and achievements, and find out what makes this ensemble cast stand out in the world of film and television.

Mark Lewis Jones
William Whitelaw

Annes Elwy
Meinir Ffransis

Richard Elfyn
Goronwy Daniels

Rhodri Meilir
Nicholas Edwards

Steffan Cennydd
Denis

Lowri Izzard
Manon

Dyfan Dwyfor
Dafydd Wigley

Lisa Jên Brown
Phyllis Kinney

Carys Eleri
Nerys

Claire Cage
Ymgynghorydd i'r Weinidog

Sharon Morgan
Marjorie

Nia Gwynne
Lady Littler

Nicola Reynolds
Lady Plowden

Steven Elliot
Lord Harlech

Eiry Thomas
Rhiannon Evans

Sian Reese-Williams
Margaret Thatcher

Rohit Gokani
Gandhi

Dewi Rhys Williams
G.O. Williams

Dafydd Emyr
Yr Arglwydd Cledwyn

Mensah Bediako
Martin Luther King

Arwel Gruffydd
Wyn Roberts

Mali O'Donnell
Ffion

Rhodri Evan
Gwynfor Evans

Lily Beau
Ceri Samuel

Osian Davies
Rupert Edwards

Sion Eifion
Dafydd Elis-Thomas

Lisa Victoria
Jennie Eirian

Geraint Wyn Tod
Emyr Jenkins

Gwion Aled Williams
Fred Ffransis

Llion Williams
Gwilym
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