The "Thunder Man" is explosives expert William Poole (Simon Oakland), who in addition to his demolition skills, happens to be a serial killer. No sooner has the episode gotten under way than Poole has murdered Joe Cartwright's girlfriend Ann. The sole witness is Ann's father, who has suffered a stroke and can only remember the curious song whistled by the killer. The plot thickens when Poole is hired by Joe's father Ben. Featured in the cast are Evelyn Scott as Mrs. Gibson, Harvey Stephens as Uncle Fred, Bill Quinn as the doctor, and Bing Russell, making his first series appearance in the recurring role of Deputy Clem. Originally telecast on May 5, 1963, "Thunder Man" was written by Lewis Reed. ~ Hal Erickson, Rovi