Chloë Sevigny as Grace Collier

Stephen Rea as Dr. Philip Lacan

Lou Doillon as Angelique Tristiana

Dallas Roberts as Dr. Dylan Wallace

JR Bourne as Larry Franklin

William B. Davis as Dr. Lucas Bryant

Gabrielle Rose as Dr. Mercedes Kent

Serge Houde as Detective Kalen

Alistair Abell as Detective Connors

Colin Chapin as Coffee Shop Worker #1

Graeme Duffy as Coffee Shop Worker #2

Talia Williams as Lily

Rachel Williams as Eve

Erica Van Briel as Sofia Tristiana

David Purvis as Patrick - Aide

Guy Jellis as Male Attendant #1

Ross Viner as Male Attendant #2

Michael Curluck as Grace's Father

Dylan Basu as Peter

Ashtyn McGuire as Young Grace

Whittni Wright as Celia (uncredited)