Tom Hollander

as Dylan Thomas

Essie Davis

as Caitlin Thomas

Phoebe Fox

as Liz Reitell

Ewen Bremner

as John Malcolm Brinnin

Celt Llewelyn-Jones

as Young Dylan

Jamie Ballard

as Jerry Hart

Demetri Goritsas

as Dr Milton Feltenstein

Samantha Coughlan

as Sylvie