When I was thirteen years old, I doted on this serial, waiting anxiously for Saturday afternoon to devour the next episode, and playing out the episodes with my friends. I am now 69,but I remember the excellent acting of Ralph Morgan and George Macready. The plot and adventures were fun. The monster is a robot. Macready is a king of crime who wants to use the robot for evil. The cliffhangers were mostly laughable cheats. In one episode you see a stunned Robert Lowery on a moving track go through the doors of a crematorium furnace. In the next, he jumps off before he gets to the doors. Aside from that, lots of fun.