A famous scientist invents a humanoid robot (the titular "monster"), so a greedy rival scientist plans to steal it for use in his criminal plans. His henchmen often kidnap a trained gorilla (the titular "ape") from the zoo, to aid in the schemes.

"A THRILLING 15 CHAPTER SERIAL OF A MECHANICAL MONSTER GONE MAD! HIS COMPANION: THE APE THAT FIGHTS CRIME...IN A WONDERFUL FANTASY"