Dakota Fanning
Mina / Lucy
Georgina Campbell
Ciara
Olwen Fouéré
Madeline
Oliver Finnegan
Daniel
Siobhan Hewlett
Mina's Mother
Alistair Brammer
John
Hannah Howland
Chloe
Charles Camrose
Conor
Diarmuid de Faoite
Watcher 1
Seán T. Ó Meallaigh
Watcher (voice)
Jacob Greenway
Jordan
Andrea Bechis
Dom
Hannah Dargan
Young Mina
Emily Dargan
Young Lucy
John Lynch
Kilmartin
Anthony Morris
Burke
Éabha Connolly
Little Girl
Kya Brame
Georgia
Shane O'Regan
Collin
Cara Steele
Millie
Shannon Antonia
Tanya
Kofi De Graft Jordan
Bobby
Ann Marie Horan
Watcher 2
Jim Tighe
Bus Driver
Joel Figueroa
Darwin (voice)
Zarima McDermott
University Student
Ffion Haf
Daria
Charlie Mann
Romeo