Pepito y el Monstruo

Pepito y el monstruo (Pepito and the Monster) is a 1957 Mexican black and white film.

Plot
Pepito becomes the assistant of a magician, in order to earn some money for his grandmother who can not work, but one day Pepito meets a monster and runs scared, but it turns out that the monster is not dangerous and becomes his friend

The monster also works for the magician, since he has it threatened, the magician turns out to be someone evil who took the identity of another magician with a special medallion that allows him to hypnotize people. He use that medallion also to hypnotize the daughter of the previous magician.

When the other magician's daughter escapes and discovers the writings of a house and a lot of money, the magician goes to look for her, hypnotizes her, Pepito and Pepito's grandmother, to take the girl back, and keep the scriptures.

Eventually the magician's assistant realizes and decides to face him, but is hypnotized and the magician orders his assistant to kill Pepito's grandmother. In the end the assistant just pretended to be hypnotized as she had replaced the amulet with a fake one without the magician noticing and the truth comes to light.