A woman encounters a giant space alien that is after the valuable diamond she wears. When he finally retrieves it, the woman becomes fifty feet tall.
This is certainly one of the most supremely silly science fiction movies of all time. It's not the worst, by any means; there's some good performances, and the direction by Nathan Juran is energetic; he keeps things moving even though the attack of the title doesn't occur until the last ten minutes of the movie. The special effects are quite awful; you find yourself wishing that Bert I. Gordon had been in charge of them, as he would have done a better job. I don't buy for a second the claim that this movie is a feminist statement of sorts; though it is possible to look at the movie in that way, it requires far too much squinting for me to believe that it was intended as such.
On the plus side, it has Alison Hayes and Yvette Vickers, two very appealing actresses of the period. Yvette Vickers seems to have developed a cult following based on this picture and THE GIANT LEECHES, a lot of it centered on her somewhat slutty sexuality, but I actually think she was a hell of an actress on top of that.
One of these days, I would like to look into how the various communications media are used to drive plots in movies like this. If I do, you can be sure I'll mention the newscaster in this movie, who gears his reports so intently on the events of the movie, that we actually have a scene of him taunting Alison Hayes from the television set. If my suspension of disbelief hadn't already been dissipated by the time I reached this scene, this one would have done it.