Marshall Brickman Director, Writer, Producer John Lithgow John Mathewson Actor Christopher Collet Paul Stephens Actor Cynthia Nixon Jenny Anderman Actor Jill Eikenberry Elizabeth Stephens Actor John Mahoney Lt. Col. Conroy Actor Sully Boyar Night Guard Actor Richard Council Government Actor Robert Schenkkan Government Aide Actor Paul Austin General Actor Adrian Sparks Scientist Actor Curt Dempster Scientist Actor Brian Ferren Lab Assistant Actor Gregg Edelman Science Teacher Actor Abe Unger Roland Actor Robert Sean Leonard Max Actor David Quinn Tennis Actor Geoffrey Nauffts Craig Actor Katherine Hiler Emma Actor Trey Cummins Terry Actor Steve Borton Local FBI Actor Harlan Cary Poe Local FBI Actor Ned Schmidtke Jenny's Parent Actor Sarah Burke Jenny's Parent Actor Fred G. Smith Conroy's Lieutenant Actor JD Cullum Eccles Actor Manny Jacobs Moore Actor Charles Fields Price Actor Eric Hsiao Saito Actor Trevor Bolling Halley's Comet Kid Actor Steve Blum Laser Efficiency Kid Actor Thomas Baum Writer Jennifer Ogden Producer Billy Williams Cinematographer Nina Feinberg Film Editing Philippe Sarde Original Music Philip Rosenberg Production Design Robert Guerra Art Director Philip Smith Set Decoration Nina Ramsey Set Decoration Shay Cunliffe Costume Design Juliet Taylor Casting