Christopher Walken as Whitley Strieber

Lindsay Crouse as Anne Strieber

Frances Sternhagen as Dr. Janet Duffy

Andreas Katsulas as Alex

Terri Hanauer as Sarah

Joel Carlson as Andrew Strieber

John Dennis Johnston as Fireman

DeeDee Rescher as Mrs. Greenberg

Aileen Fitzpatrick as Mother

R.J. Miller as Father

Holly Fields as Praying Mantis Girl

Juliet Sorci as Second Grade Girl

Irene Cagen as Sally

Paula Shaw as Woman from Apartment

Joshua John Miller as Tall Boy

Basil Hoffman as Dr. Friedman

Johnny Dark as Lab Technician

Sally Kemp as Laurie

Ingrid Vold as Magician's Assistant (uncredited)

Tifni Twitchell as Teacher

Kate Stern as Woman on Bus

Jonathan Fromdahl as Whitley (5 years)

Andrew Magarian as Man in Hallway

Paul Clemens as Patrick

Maggie Egan as Nancy

Vince McKewin as Bob