While not a direct sequel to Invisible Man Appears, Invisible Man Vs the Human Fly and the latter are usually thought of as companion pieces. Human Fly is more preposterous and more imaginative, and therefore more entertaining, then Invisible Man Appears. Both films are interesting in their serious approach to the police procedural genre element, and because Fly is more effective with this aspect of its story, on that level it is also better than the first film. It is not a great movie, but both films are odd curiosities within Japanese post-war cinema culture, and are worth viewing for fans of the period and certainly for fans of 1950s world sci-fi cinema.

Seven years after The Invisible Man Appears, Daiei released this sequel which begins with a series of murders that seem to be the work of an invisible man. However, there seems to be the sound of buzzing with each kill.

It's the work of a war criminal who created the formula and as a result, was left stranded on the island where his lab was. Now, he's killing each of his associates in their new lives with the help of his brutal assistant, who is now addicted to the formula that allows him to become a human fly.

Now that scientists have made the invisible formula safe for humans, can a brave soul - or two - use it to protect the world from the Human Fly, who is now leaving bombs on trains and killing hundreds of people at a time?

At one point, this was going to be released in the U.S. as The Murdering Mite. It was never released, however.

How awesome is it that this movie basically has two Vincent Price characters, the Invisible Man and the Fly, fighting against one another? Seriously, the little fly man is super sinister and awesome in every scene, making this movie for me.

There are a series of mysterious stabbing deaths in post war Tokyo. Yet no attacker was seen or could have gained entry. Police investigate. They find that the deaths are preceded by buzzing sounds. A group of Japanese scientists were working on cosmic ray research during war and one (Kuroki) feels he was sold out by the others. He spend 6 years in prison and wants to get even. He has a gas that shrinks humans to fly size so they can do his dirty work. Another Scientist has developed a ray that makes objects invisible. A cop uses it on himself and while invisible discovers what Kuroki is up to. But Kuroki finds out about the invisible ray and wants it. This is a film with good acting, audio and video quality. Even the fake cosmic ray lab is realistic. But it is all lost when we see the tiny shrunken man flying around in his business suit, without wings making buzzing sounds. It is so completely unbelievable that it's hilarious. In Japanese with English subtitles. Black and White.