Dakota Fanning

Mina / Lucy

Georgina Campbell

Ciara

Olwen Fouéré

Madeline

Oliver Finnegan

Daniel

Alistair Brammer

John

John Lynch

Kilmartin

Siobhan Hewlett

Mina's Mother

Hannah Dargan

Young Mina

Emily Dargan

Young Lucy

Joel Figueroa

Darwin (voice)

Thabile Michelle Hlongwane

Newscaster

Anthony Morris

Burke

Shane O'Regan

Collin

Jim Tighe

Bus Driver

Zarima McDermott

University Student

Morgan Bailey-Rocks

Younger Boy

Christian Bailey-Rocks

Older Brother

Éabha Connolly

Little Girl

Hannah Howland

Chloe

Kya Brame

Georgia

Ffion Haf

Daria

Shannon Antonia

Tanya

Kofi De Graft Jordan

Bobby

Charles Camrose

Conor

Charlie Mann

Romeo

Jacob Greenway

Jordan

Andrea Bechis

Dom

Cara Steele

Millie

Seán T. Ó Meallaigh

Watcher (voice)

Diarmuid de Faoite

Watcher 1

Ann Marie Horan

Watcher 2

Niamh McHenry

Woman in Shop (uncredited)