Dr Adrian (Boris Karloff) is an unpopular MD in a small town who is well-meaning but obsessed with helping Francis (Maris Wrixon) who is crippled after polio. The doctor devises a possible cure using spinal fluid but he runs out of fluid. Meanwhile, an ape has escaped from the circus. The ape attacks the doctor but he manages to kill it.
Doctor Adrian begins to use the skin of the ape to kill bad men and drain their spinal fluid so he can continue his treatments. Another Doctor (Selmer Jackson) becomes suspicious of Adrian and his methods...
This is a strange film, the ape is so obviously a man in an unconvincing suit (in fact it was Ray "Crash" Corrigan) and there is little actual menace because of that. A fun enough film all the same.