One of the features of the "Adventures of Superman" was that science was often responsible for all manner of devices and situations, but no effort was made to explain how. We are to rather childishly accept that a pack of knuckle-headed crooks have the expertise to create a machine that uses sophisticated radar and can turn people invisible. All they needed to do was put a coin in a slot, pull a lever, and wherever the corresponding thief was, he would be made invisible. A sort of slot machine. This allowed him to walk into a jewelry store, a warehouse, or a bank and simply help himself to whatever. Inspector Henderson is being criticized for his failure to confront these robberies but he is utterly puzzled. Of course, when you eliminate all falsities, it is what is left that is the answer. Clark suggest invisibility and is just about laughed out of the precinct. Once theorized, it can be tested and is. The crooks, as usual, are so full of themselves, that they can't leave well enough alone. It's a fun premise but really!