Kalbi Genç

William B. Davis

Cigarette Smoking Man

Dick Anthony Williams

Agent Reggie Purdue

Alan Boyce

Young John Barnett

David Ross Paterson

John Barnett (uncredited)

Graham Jarvis

NIH Doctor

Merrilyn Gann

Prosecuting Attorney

Robin Mossley

Dr. Joe Ridley

Courtney Arciaga

Young Child

Gordon Tipple

Joe Crandall

Robin Douglas

Computer Tekkie

Christine Estabrook

Agent Henderson

Jerry Hardin

Deep Throat - Ronald