<p>Even though Pazuzu only flashes on the screen for several seconds in <em>The Exorcist</em>, the visual leaves a terrifying and lasting impression long after the credits roll. The voice behind the petrifying Pazuzu demon belongs to actress Mercedes McCambridge, who started her career in radio in the 1940s. She later starred in the original cast of the soap, <em>Guiding Light</em>, and has appeared in films such as <em>All the King's Men</em> (1949), for which she earned an Academy Award nomination for Best Supporting Actress.</p>