Walt Masterson is a jewel thief in the WB TV series Smallville. He was the secondary antagonist in the Season Three episode "Whisper".
He was portrayed by William MacDonald.
Walt Masterson had his apprentice Nathan Dean help him with a jewelry store robbery, using his ability to project a supersonic sound to incapacitate the shopkeeper and customers while Walt grabbed everything of value.
Masterson was armed with a pistol and a pair of earplugs to avoid being deafened by Nathan's supersonic sound. As Nathan used his sonic screech, Masterson pulled his gun just as the glass jewelry cases began to shatter.
Clark Kent attempted to blast Masterson with his heat vision but a piece of costumed jewelry made from meteor rock flies across the room. One beam hits Masterson's hand and he dropped his gun but another blast hits the meteor rock and bounces back into Clark's face, blinding him.
The jeweler levels a shotgun at Masterson as Nathan slips away into the crowd with the other customers. Walt was taken into police custody.
Masterson had landed on Judge Abigail's court calendar who was Pete Ross' mother. Masterson had Nathan kidnap Pete Ross to get Judge Abigail Ross to dismiss the charges against him. When Clark regained his sight, he planned to to go to the courthouse and follow Masterson if Judge Ross released him. At the Lowell County Courthouse, Clark overheard Masterson talking with Nathan who promises that Pete will be a "pile of junk". However, Clark managed to save Pete and defeat Nathan, and Masterson remained in police custody.