Several workers in a tunnel construction project are killed in a depressurization chamber when the air pressure in it drops too quickly. Commentary on the real sandhogs of the day plus Kenny Delmar as Commissioner Weston in which we compare his most popular role as Senator Beauregard Claghorn from Fred Allen's Allen's Alley to that as the inspiration to one of Warner Brothers most famous cartoon characters.

Last time, Clark freed Professor Browning who is the man behind the discovery of the radium ore deposit. But as they escape, Browning points out the running lights of a ship in which Kent will now see how these men are made to dig in the mines. Commentary on the use of reverse angles to enhance the Superman action as well as lead villain Deutch becoming more sadistic.

A burglar is breaking into homes between 3:30 to 6pm using a credit card to open the lock. He robs the place and has a glass of milk before he leaves. Commentary on Fatima Cigarettes who will soon exit as sponsor of Dragnet.

Clark and Jimmy witnessing hundreds of men chained together in the bottom of the pit of the volcano. Commentary on breaking down radium.

While marooned on Volcano Island, both he, now as Clark Kent, and Jimmy witness a sea plane descending into the side of a volcano that opened up like a giant hatch.

Several crewmen at sea have been treated for infection by the ship's doctor in which life saving amputations of the "infected" area had been performed while some have died. But what is the real sinister motive behind the cause of these infections? Discussion on the superior audio quality of this episode, as well as great storytelling, and where other pristine copies might be. We also discuss Cranston's sudden medical prowess and why this episode is completely misnamed as the Shadow doesn't return from anywhere.

While tracking his dog, Storm, onto a mysterious sea plane, the plane starts to take off before Jimmy and his dog can get off. Where is this plane going? Could it be on its way to where Deutch is hiding? Commentary on the emerging "Super-Kent" in this series.

A call comes in on a man after suffering a heart attack had died after he had fallen and fractured his skull. However, there is someone who knows more to the story that this man's death. Commentary on actor Sammy Ogg who co-starred in this episode. Plus actress June Whitley.

Last time, Kent and Lewis found themselves courting danger as they investigate a car that was pushed into the water. Little do they know that Deutch has them in his sights. Commentary on the maturity of the characters and the actors now fully understanding their roles.

Lamont and Margo investigate a mad scientist who uses a rival scientist's mechanical robot to take revenge on those who turned down his invention. Commentary on the origin of the word robot, how this episode and other works of art accurately depicted what our technical future would be. We also take a look at Fritz Lang's Metropolis.