Sharing what I found while imdb'ing this week's poll. I'm leaning towards She-Creature.
The She-Creature (1956) -
http://www.imdb.com/title/tt0050957/?ref_=fn_al_tt_2 - Using hypnosis, Dr. Carlo Lombardi claims that he can have his patients regress and recover memories from their past lives, thereby proving that reincarnation exists. He also claims that the spirit of these past lives can be brought forth to take physical form.. A series of violent murders by a creature that seems to disappear into the sea suggests that Lombardi's claim may be correct. The medical and scientific community believe him to be a complete fraud but one enterprising businessman sees the opportunity to make a small fortune with Lombardi's ability.
Voodoo Woman (1957) -
http://www.imdb.com/title/tt0051174/?ref_=fn_al_tt_1 - Deep in the jungles a mad scientist is using the natives' voodoo for his experiments to create an indestructible being to serve his will. When a party of gold seekers stumbles upon his village, the scientist realizes that Marilyn the expedition's evil leader is the perfect subject for his work.
Ghost of Dragstrip Hollow (1959) -
http://www.imdb.com/title/tt0052844/ - A group of drag-racing fanatics, members of a Los Angeles club, move into an old deserted mansion and set up shop, making it their headquarters. They hold a Halloween masked ball for the club's grand opening, and invite everyone to come dressed as their favorite monster! Oddly enough, the festivities turn sour when one of the bright youths discovers an impostor among them in the form of an honest-to-gosh live monster who's been hogging all the dances with the best-looking girls!
Teenage Caveman (1958) -
http://www.imdb.com/title/tt0052279/?ref_=fn_al_tt_3 - Robert Vaughn stars as a white 25-year-old teenage caveman with styled hair who seeks to discover what is in the uncharted jungles beyond his tribe's campsite. It is against the Word (and the Word is the Law), but he breaks it anyway. Soon he discovers a strange creature which kills with its touch.
Creature of Destruction (1967) -
http://www.imdb.com/title/tt0061529/ - A hypnotist is able to predict murders by a terrifying sea monster. In reality, he causes the murders through his lovely assistant, who is the reincarnation of the monster.