- Michael Sheen
- Aneurin 'Nye' Bevan
- Sharon Small
- Jennie Lee
- Remy Beasley
- Gwen Davies
- Matthew Bulgo
- Mr. Orchard
- Dyfan Dwyfor
- Luke Williams
- Roger Evans
- Archie Lush
- Ross Foley
- Clerk
- Jon Furlong
- Herbert Morrison MP
- Daniel Hawksford
- Neil Jones
- Stephanie Jacob
- Clement Atlee
- Kezrena James
- Arianwen
- Tony Jayawardena
- Winston Churchill
- Nicholas Khan
- Neville Chamberlain / Mr Frankle
- Rhodri Meilir
- David Bevan
- Lee Mengo
- Jack Stockton
- David Monteith
- Mr. Fury / Ensemble / Understudy - Winston Churchill
- Sara Otung
- Sara Lewis
