In "The Phantom Creeps" Episode 5, titled "Thundering Rails," the relentless chase against the sinister Dr. Zorka continues. Zorka, armed with his deadly inventions, turns his attention to disrupting the nation's transportation systems. Utilizing his destructive capabilities, he targets vital railroads, causing chaos and endangering lives. Government agents, led by Captain Bob West, and journalist Jean Drew race against time to thwart Zorka's plans. The episode unfolds with intense railway action, perilous situations, and a growing awareness of the urgent need to neutralize Zorka's threat. "Thundering Rails" adds another layer of excitement to this 1939 science fiction serial.