Atragon

There's something about this film that I can't help but like.

Everything is just one step beyond plausible. The bad guys have all sorts of powers that are used once and then never used again. The flying submarine Atragon has been built completely in secret by an Japanese Navy unit, in self-imposed exile, that is preparing to win World War 2 for Japan in 1963! There's a giant pet serpent that attacks the submarine. An entire city is destroyed in a way I won't describe but is completely wacky.

Silly and lots of fun. The special effects go from great to cheap to unbelievably weird. The movie is slow at points but when the sub finally takes off, it's non-stop action. You'll recognize the actors from many of the Godzilla films.