now this is a great serial. wish I had seen it as a kid, it would have been right up my alley. it's action packed and has a cool hero in it. the plot is good and all the cliffhangers make sense. it's worth all the praise it gets. The Secret Code has little lectures at the end of each chapter talking about how to break codes. this was apparently patterned after "Spy Smasher".
ironically enough, the Black Commando is very similar to Commander Courage from the mockumentary "Comic Book: the Movie" or at least what the producers of the movie want to turn him into.