Lauren Ambrose

as Susan Wheeler

Natalie Knepp

as Hanna Goldberg

Michael Weston

as Peter Arno

Joe Morton

as Nelson

James Rebhorn

as Oren

Richard Dreyfuss

as Professor Hillside

James Woods

as Dr. Howard Stark

Ellen Burstyn

as Mrs. Emerson

Geena Davis

as Dr. Agnetta Lindquist

Steven Pasquale

as Mark Bellows