Ebirah, Horror of the Deep (1966)

aka Godzilla vs. the Sea Monster

The series returns from the terrors of outer space to the horrors of the deep sea; I’m happy with that, because some of the things that live down there are more alien than many sci-fi concepts anyhow.
Four guys get washed ashore on an island and flaff around for a while before the bad guys and their James Bond-esque nuclear bomb-making facility is introduced. If that wasn't bad enough, the creature attack is by a giant, cumbersome, unimaginative lobster. The slide into the ridiculous is cemented by the addition of some very dodgy music.
Putting the lobster-suited guy in shallow water was a cheapo way to imply scale on a reduced budget. It’s not as much fun as model cities being stomped, but the change in environment is worked well into the plot.

Ebirah was new but the film was Godzilla's 7th and Mothra's 4th.

2½ rubber legs out of 5