Bob Gunton is a character actor with 125 credits to his name, including several seasons of "24" and "Desperate Housewives" and a host of movie roles in films such as the Oscar-winning "Argo." Vaguely familiar faces like his are common in the Los Angeles area where he lives, and nobody pays much attention. Many of his roles have been forgotten.

But every day, the 68-year-old actor says, he hears the whispers—from cabdrivers, waiters, the new bag boy at his neighborhood supermarket: "That's the warden in 'Shawshank.' "

He...