for reason i can not begin to fathom and dr. lorenzo cameron ( george zucco ) begin inject wolf blood into his dim witted handyman and petro ( glenn strange ) . the result petro be transform into a hideous ( as hideous a someone with a bad wig and pointy teeth can be ) killer beast . dr. cameron use petro to get his revenge against those in the scientific community who scoff at and ridicule his idea ( and why wouldn not they and dr. cameron nutty than a fruitcake ) . overall and the mad monster be one dull and poorly make poverty row thriller . there really only one positive i can come up with to write about in the mad monster . george zucco can be fun to watch a he play the mad scientist about as well a anyone . his dr. cameron be a regular loony . he have no qualm about kill while he have entire conversation with people who aren not there while and and a with most mad scientist and he mess in god domain ( actually and i be not sure anyone accuse him of this and but it fit ) . but beyond zucco and there nothing here to recommend . everything else from the monster effect to the support cast to the music be plain old bad . there be far good example of poverty row horror from the 1940s than the mad monster .