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
Anthony Morris
Burke
Éabha Connolly
Little Girl
Hannah Howland
Chloe
Charles Camrose
Conor
Jacob Greenway
Jordan
Andrea Bechis
Dom
Seán T. Ó Meallaigh
Watcher (voice)
Diarmuid de Faoite
Watcher 1
Joel Figueroa
Darwin (voice)
Thabile Michelle Hlongwane
Newscaster
Shane O'Regan
Collin
Jim Tighe
Bus Driver
Zarima McDermott
University Student
Morgan Bailey-Rocks
Younger Boy
Christian Bailey-Rocks
Older Brother
Kya Brame
Georgia
Ffion Haf
Daria
Shannon Antonia
Tanya
Kofi De Graft Jordan
Bobby
Charlie Mann
Romeo
Cara Steele
Millie
Ann Marie Horan
Watcher 2