While Toho was reinventing the monster movie for Japan, Disney had had a monster hit with the hugely ambitious 20,000 Leagues Under The Sea (1954), which featured a hugely memorable attack by a giant squid. This rather lower-budgeted effort the following year upscaled a giant octopus so that it posed a threat to entire cities and set it loose. As with Godzilla, it was underwater nuclear testing that dislodged the huge cephalopod from its home and sent it ravening, but with stop-motion effects by the legendary Ray Harryhausen, the tentacled terror headed for San Francisco (because monsters always do, when visiting the West coast) and takes a punt at the Golden Gate Bridge. The Bridge wins, but only thanks to the combined heroism of a submarine commander and a naturalist.