Robert Pattinson as Jerome Fontana

Julianne Moore as Havana Segrand

Mia Wasikowska as Agatha Weiss

John Cusack as Dr. Stafford Weiss

Evan Bird as Benjie Weiss

Olivia Williams as Cristina Weiss

Sarah Gadon as Clarice Taggart

Kiara Glasco as Cammy

Dawn Greenhalgh as Genie

Jonathan Watton as Sterl Carruth

Carrie Fisher as Self

Jennifer Gibson as Starla Gent

Gord Rand as Damien Javitz

Justin Kelly as Rhett

Niamh Wilson as Sam

Clara Pasieka as Gretchen Voss

Emilia McCarthy as Kayla

Allegra Fulton as Harriet

Domenic Ricci as Micah

Jayne Heitmeyer as Azita Wachtel

Sean Robertson as Roy

Ari Cohen as Jeb

Joe Pingue as Arnold

Christian Lloyd as Stu

Donald Burda as Hank

Amanda Brugel as Star! Channel Interviewer

Alden Adair as 2nd AD (Blue Matrix)

David Amito as PA (Blue Matrix)

Dan Lett as Talk Show Host

Sandra Battaglini as Havana's Housekeeper

Joanne Reece as Nurse

Chris Anton as Rusty

George Kolitsopoulos as Dispatcher

Joseph Murray as Young Intern

Adrienne Wilson as Wife

Murray Furrow as Husband

Neil Girvan as Bad Babysitter 2 Director

Stephen Radley III as Assistant Principle