Rhodri Evan as Gwynfor Evans

Mark Lewis Jones as William Whitelaw

Eiry Thomas as Rhiannon Evans

Sian Reese-Williams as Margaret Thatcher

Rhodri Meilir as Nicholas Edwards

Lily Beau as Ceri Samuel

Lisa Jên Brown as Phyllis Kinney

Sharon Morgan as Marjorie

Claire Cage as Ymgynghorydd i'r Weinidog

Steffan Cennydd as Denis

Osian Davies as Rupert Edwards

Dyfan Dwyfor as Dafydd Wigley

Sion Eifion as Dafydd Elis-Thomas

Richard Elfyn as Goronwy Daniels

Carys Eleri as Nerys

Steven Elliot as Lord Harlech

Annes Elwy as Meinir Ffransis

Dafydd Emyr as Yr Arglwydd Cledwyn

Mensah Bediako as Martin Luther King

Rohit Gokani as Gandhi

Arwel Gruffydd as Wyn Roberts

Lowri Izzard as Manon

Nia Gwynne as Lady Littler

Mali O'Donnell as Ffion

Nicola Reynolds as Lady Plowden

Geraint Wyn Tod as Emyr Jenkins

Lisa Victoria as Jennie Eirian

Dewi Rhys Williams as G.O. Williams

Gwion Aled Williams as Fred Ffransis

Llion Williams as Gwilym