aka The Spider
How bad is it? I think it's pretty decent for a 1950's monster flick.
Should you see it? Yes, but not because it's laughably bad.
One of Bert I. Gordon's better efforts, this has a great opening scene before it becomes pedestrian and teenagers explore a cave, find the giant spider, can't get authorities to believe them at first, etc. The spider is rather quickly dispatched with DDT, then taken to the local high school gym for storage. The spider turns out to be much harder to kill than at first thought. The spider does change size at times and the characters aren't developed, but this is a fairly straightforward exercise. The tacked-on rock and roll number isn't terrible, either.