A young artist gets stranded in an extensive, immaculate forest in western Ireland, where, after finding shelter, she becomes trapped alongside three strangers, stalked by mysterious creatures each night.
| Actor | Role |
|---|---|
 Dakota FanningMina / Lucy | Mina / Lucy |
 Georgina CampbellCiara | Ciara |
 Olwen FouéréMadeline | Madeline |
 Oliver FinneganDaniel | Daniel |
 Alistair BrammerJohn | John |
 John LynchKilmartin | Kilmartin |
 Siobhan HewlettMina's Mother | Mina's Mother |
 Hannah DarganYoung Mina | Young Mina |
 Emily DarganYoung Lucy | Young Lucy |
 Joel FigueroaDarwin (voice) | Darwin (voice) |
 Thabile Michelle HlongwaneNewscaster | Newscaster |
 Anthony MorrisBurke | Burke |
 Shane O'ReganCollin | Collin |
 Jim TigheBus Driver | Bus Driver |
 Zarima McDermottUniversity Student | University Student |
| MMorgan Bailey-RocksYounger Boy | Younger Boy |
| CChristian Bailey-RocksOlder Brother | Older Brother |
 Éabha ConnollyLittle Girl | Little Girl |
 Hannah HowlandChloe | Chloe |
 Kya BrameGeorgia | Georgia |
 Ffion HafDaria | Daria |
 Shannon AntoniaTanya | Tanya |
 Kofi De Graft JordanBobby | Bobby |
 Charles CamroseConor | Conor |
 Charlie MannRomeo | Romeo |
 Jacob GreenwayJordan | Jordan |
 Andrea BechisDom | Dom |
 Cara SteeleMillie | Millie |
 Seán T. Ó MeallaighWatcher (voice) | Watcher (voice) |
 Diarmuid de FaoiteWatcher 1 | Watcher 1 |