- David Cronenbergwritten by and
- Norman Sniderwritten by
- Jack Geaslandbased on the book "Twins" by
- Richard W. Farrell(as Richard Farrell)
- Jill Hennessy(as Jillian Hennessy)
Rest of cast listed alphabetically
- David Cronenberg(uncredited)
- Julian-Peter Marcantonio(uncredited)
- Greg Van Riel(uncredited)
- Carol Baumexecutive producer
- John Boardassociate producer
- Marc Boymanproducer
- David Cronenbergproducer
- James G. Robinsonexecutive producer (uncredited)
- Sylvio Tabetexecutive producer
- Peter Suschitzkydirector of photography
- Eva Coudoulouxmakeup artist
- Shonagh Jabourmakeup artist
- Ivan Lynchhair designer
- Maxine Rennes-Gundersonassistant hair stylist (as Maxine Rennes)
- Barbara Szablowskiassistant makeup artist
- Gabriella Martinellipost-production supervisor / production manager
- John Boardfirst assistant director
- Cynthia Claytontrainee assistant director (as Cyndie Clayton)
- Kevin Larstoneassistant director: T.V. soap opera
- Laurie Mirskythird assistant director
- Izidore K. Musallamsecond assistant director
- Peter Carrthird assistant director (uncredited)
- John Bannisterscenic artist
- Andrew Chathamassistant head carpenter
- Kirk Cheneyconstruction manager
- Ane Christensenassistant set dresser
- Ying Chungcarpenter
- Brian Clancycarpenter
- Janet Cormackscenic artist
- Casey De Snoocarpenter
- Chris Duttonset dresser
- J.C. Edwardscarpenter
- Terry Burkefoley artist
- Richard Cadgersound editor
- Viktoria Cseh-McCormickassistant sound editor (as Victoria Cseh)
- David Evanssound editor
- David Giammarcosound editor
- Wayne Griffinsound editor
- Sean Kellyassistant sound editor
- Judy 'Lucky' Kemenyassistant sound editor (as Judy Kemeny)
- Michael LaCroixboom operator (as Michael Lacroix)
- Bill Francislab assistant
- Derek Howardlab supervisor
- Walter Klassenmechanical design
- Don McLeodartist
- Gordon J. Smithspecial effects designer (as Gordon Smith)
- Dimitris Anapliotisoptical printer
- Randall Balsmeyermotion control programmer
- Jon Campfensoptical printer
- Chris Furniotisoptical line-up
- George Furniotisoptical direction
- John Furniotisoptical direction (as G. John Furniotis)
- Shelly Morrowjunior optical layout/camera animation
- Richard Palinmotion control assistant
- Alan Peppiattrotoscope artist
- Don Snowdonrotoscope artist
- Scotty Allangaffer
- Roger Bowdengenerator operator
- Carlo Campanakey grip
- Arthur E. Coopersecond assistant camera
- Marijo Corcorancamera trainee
- Robert Cronesteadicam operator
- John Dennistonassistant cameraman: T.V. soap opera
- Attila Dorystill photographer
- Nigel Draperelectric / lamp operator (uncredited)
- Ted Fanyeckelectric
- Peter Gruczaanimation stand
- Peter Lavenderextras casting
- Melanie Tanzextras casting
- Trysha Bakkerwardrobe assistant
- Jay Du Boissonwardrobe mistress (as Jay DuBoisson)
- Nancy Dugganseamstress
- Brenda Gilleswardrobe assistant
- Patricia Hanleyseamstress
- Lesley Clarkpost-production assistant
- Charlotte Disherediting production assistant
- David Giammarcosecond assistant editor
- Chris Hintoncolour timer
- Bernadette Kellytrainee assistant editor
- Susan Maggisecond assistant editor
- Michael Reafirst assistant editor
- Sandra Tuckerpost-production assistant
- Steve Weslakassociate editor
- Anthony Kadaklocation assistant
- Neil Kredentserlocation assistant
- Vince Nyuliunit location manager
- Lillian Sarafinchanlocation manager
- Homer Denisonorchestration
- Brian Eddollselectronic music preparation
- Dick Lewzeymusic re-recording engineer
- London Philharmonic Orchestramusic performed by (as The London Philharmonic Orchestra)
- Suzana Pericmusic editor
- Howard Shoreconductor / music producer (uncredited)
- Dug Rotsteinscript supervisor
- David Browndriver
- Frances Hendryhead driver
- Allen Kosonicdriver (as Al Kosonic)
- Jerome McCanndriver captain
- Chris Radley Waltersdriver (as Chris Radley-Walters)
- Steven Sacrobdriver (as Steve Sacrob)
- Richard Spiegelmantransportation coordinator
- Jami Abellassistant: Mr. Roth
- Jim Breithauptpost-production accounting
- John P. Casselsproduction assistant
- Lesley Clarkassistant: Mr. Boyman
- Prudence Emeryunit publicist
- Alice Ferrierproduction coordinator
- Marta Fischerproduction assistant
- John Gaskinassistant accountant
- Janet Gayfordproduction secretary
- Donato Baldasarraspecial thanks: A.C.F.C.
- Celia Hamiltonspecial thanks: ACTRA
- Lynn Kellyspecial thanks: C.A.M.E.R.A., Local 81
- Scot Laughtonspecial thanks: Portico Design + Development, Toronto
- Harvey Pasternakspecial thanks (as Dr. Harvey Pasternak)
- Don Percifieldspecial thanks: Directors Guild of Canada Inc.
- Arthur Winklerspecial thanks: Chubb Insurance Company of Canada
- Christopher Woodspecial thanks: Panache Design, Toronto (as Christopher & Suzanne Wood)
- Suzanne Woodspecial thanks: Panache Design, Toronto (as Christopher & Suzanne Wood)
Crew verified as complete
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