David Cronenberg	...	(Director)
David Cronenberg, Norman Snider, Bari Wood, Jack Geasland	...	(Writer)
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	...	Wolleck / 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
Howard Shore	...	Composer
Peter Suschitzky	...	Cinematographer
Ronald Sanders	...	Editor

Summary: The Mantle brothers are both doctors - both gynecologists - and identical twins. Mentally however, one of them is more confident than the other, and always manages to seduce the women he meets. When he's tired of his current partner, she is passed on to the other brother - without her knowing. Everything runs smoothly, until an actress visits their clinic, and the shy brother is the first to fall in love. Will they be able to 'share' her ?