I too saw this movie on the MST3K show along with another Rocky Jones movie, "Clash of the Moons". I give it two stars just for the laughable special effects. The Mystery Science guys really had a ball with this one and probably had more zingers for the movie than they could fit into the alloted time. Really bad performances, terrible dialog, dull characters and a story line that barely fits the definition of a plot make this a prime candidate for the riffing it received. Having grown up in the 50s, I remember many of the serial movies that appeared and at the time were entertaining, if only for the fact that there wasn't much else to watch. That is probably why so many sub-par movies made it to TV back then. With very limited material for TV audiences, the viewers were probably happy to get whatever they could. The other Rocky Jones movie on MST3K was equally as bad and got a thorough riffing from the MST3K cast.