Jake Gyllenhaal as Adam / Anthony

Mélanie Laurent as Mary

Sarah Gadon as Helen

Isabella Rossellini as Mother

Joshua Peace as Teacher at School

Tim Post as Anthony's Concierge

Kedar Brown as Security Guard

Darryl Dinn as Video Store Clerk

Misha Highstead as Lady in the Dark Room

Megan Mane as Lady in the Dark Room

Alexis Uiga as Lady in the Dark Room

Kiran Friesen as Sad, Broken Woman (uncredited)

Loretta Yu as Receptionist (uncredited)

Stephen R. Hart as Bouncer (uncredited)

Paul Stephen as Dark Room Patron (uncredited)