Uneven sci-fi-horror which is mainly remembered for Ray Harryhausen’s stop motion giant amphibious octopus which takes apart San Francisco at the climax, most famously, the Golden Gate Bridge. Columbia ripped off the title from Universal’s It Came from Outer Space (1953), but this is unrelated.
It is more of a companion to another monster picture, The Beast from 20,000 Fathoms (1953), because Harryhauson was also animator, and they are both semi-aquatic atomic paranoia stories. The mega-octopus is the result of US H-bomb tests in the Pacific.
Though there isn’t really an ecological or anti-nuclear message. It’s just a creature feature which reserves all of its meagre budget for the effects of the colossal sea creature on the rampage. The first hour might as well have been made for radio, as the scientists exchange exposition in front of crude sets.
And it’s completely inert. The buff Navy Commander (Kenneth Tobey) pursues the foxy marine biologist (Faith Domergue), sometimes in beachwear. Which provokes an unexpected oration about ‘50s feminism. But the climax with the colossal radioactive beast stomping on ‘Frisco Bay is sensational, and legendary.