The story is told in a comic book style but it grabbed my attention even though I didn't know the actors or anything else about it. It has a sense of humor in its silliness which is probably a turnoff for adults. I watched it again and was amazed at how much I remembered from seeing it 50 years ago. I can't really give this movie a rating because it is so unconventional. It is like watching a cartoon except filmed on location with live actors. The closest comparison I could make to it would be the Batman TV show that was also in the 1960s.
Review of Fearless Frank
