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this is another toho entry-its quite good.about a man who under goes an experiament to become invisable.
I've not seen this, but it's about a man who can reduce himself to a vaporous state, not become "invisable". Hence the title. It stars "The Controller of Planet X" himself, Yoshio Tsuchiya as the gaseous one.

There is a Toho invisible man film (um, The Invisible Man...) made the same year as Gojira--1954.
"If I had a hidden microphone inside of my heart, I would turn the power on..."