Also Known As:- Alter ego
- Die Unzertrennlichen
- Dubbelgångare
- Erottamattomat
- Faux-semblants
- Gêmeos - Mórbida Semelhança
- Gemini
- Inseparabili
- Inseparables
- Irmãos Inseparáveis
- Két test egy lélek
- Kobni blizanci
- Mortalmente parecidos
- Nierozlaczni
- Oi dihasmenoi
- Oskiljaktiga
- Pacto de amor
- Twins
- Una vez en la vida
- David Cronenberg
- Bari Wood (book "Twins")
- Jack Geasland (book "Twins")
- David Cronenberg
- Norman Snider
- Jeremy Irons ... Beverly Mantle / Elliot Mantle
- Geneviève Bujold ... Claire Niveau (as Genevieve Bujold)
- Heidi von Palleske ... Cary (as Heidi Von Palleske)
- Barbara Gordon ... Danuta
- Shirley Douglas ... Laura
- Stephen Lack ... Anders Wolleck
- Nick Nichols ... Leo
- Lynne Cormack ... Arlene
- Damir Andrei ... Birchall
- Miriam Newhouse ... Mrs. Bookman
- David Hughes ... Superintendent
- Richard W. Farrell ... Dean of Medicine (as Richard Farrell)
- Warren Davis ... Anatomy Class Supervisor
- Jonathan Haley ... Beverly, Age 9
- Nicholas Haley ... Elliot, Age 9
- Marsha Moreau ... Raffaella
- Denis Akiyama ... Pharmacist
- Dee McCafferty ... Surgeon
- Susan Markle ... Operating Room Nurse
- Murray Cruchley ... Assisting Surgeon
- Jane Luk ... Lecture Hall Nurse
- Tita Trevisan ... Furniture Salesman
- Jacqueline Hennessy ... Coral (as Jacqueline Hennessy)
- Jill Hennessy ... Mimsy (as Jillian Hennessy)
- David Walden ... Director
- Liliane Stillwell ... Wardrobe Person
- Denise McLeod ... Art Gallery Lady
- Bob Bainborough ... Mr. Glaser
- Nick Rice ... MC (as Nicholas Rice)
- Joe Matheson ... Sean
- Hadley Kay ... Delivery Boy
- Cynthia Eastman ... Sobbing Woman
- Nora Colpman ... Mrs. Randall
- Rena Polley ... Soap Opera Character
- Madeleine Atkinson ... Soap Opera Character
- John Bayliss ... Performance Double
- Graham Evans ... Picture Double
- David Cronenberg ... Obstetrician
- Alan Gough ... Director / producer of TV soap opera
- Jordan-Patrick Marcantonio ... Twin Boy
- Julian-Peter Marcantonio ...
- Greg Van Riel ... Man in reception
