Jake Gyllenhaal

Adam / Anthony

Mélanie Laurent

Mary

Sarah Gadon

Helen

Isabella Rossellini

Mother

Joshua Peace

Teacher at School

Tim Post

Anthony's Concierge

Kedar Brown

Security Guard

Darryl Dinn

Video Store Clerk

Misha Highstead

Lady in the Dark Room

Megan Mane

Lady in the Dark Room

Alexis Uiga

Lady in the Dark Room

Kiran Friesen

Sad, Broken Woman (uncredited)