Untamed Women (1952)

Starring Mikel Conrad, Doris Merrick, Richard Monahan, Mark Lowell, Morgan Jones
Directed by W. Merle Connell

(actor & director credits courtesy IMDB.com)

Four men aboard a bomber plane crash land near an island, where they find themselves the prisoners of an ancient race of Druid women, and later encounter giant prehistoric creatures. 

Conrad stars as the leader of the ragtag crew, who has three very different men under his command, including a man who enlisted to get away from his mother, a simple farm boy, and a far too verbose Brooklynite always preaching the joys available in his home town.  There's some sexist dialogue among the men, although the women have the upper hand for most of the film, thanks to a chief played by Merrick who's eager to do away with the men.  Once the men get away and encounter the prehistoric animals, it's a disappointment because the footage is obviously cribbed from One Million B.C. with armadillos, lizards, and other creatures standing in.  Nevertheless, there were parts of the film I enjoyed, and it's a pretty hard to find sci-fi film from the era of the 1950s, which makes it merit a look.       

Not Of This Earth (1957)

Starring Paul Birch, Beverly Garland, Morgan Jones, William Roerick, Jonathan Haze
Directed by Roger Corman
(actor & director credits courtesy IMDB.com)

An alien dependent on consuming blood for his survival poses as an invalid while using his abilities to capture new victims and make plans for an invasion of the Earth.

One of Corman's most efficient sci-fi thrillers doesn't need to utilize many special effects, using Birch's slow-talking performance and eerie contact lenses to convey the menace more than adequately.  Birch, who I've heard had conflict with Corman on the set and had to be replaced with a double, is nonetheless a favorite actor of mine with a memorable voice and delivery, making his alien villain more than watchable.  He's joined by several Corman regulars, Garland as the spunky nurse, Haze as Birch's ex-con chauffeur, and Dick Miller as an ill-fated vacuum cleaner salesman.  Composer Ronald Stein adds some eerie themes and driving chase motifs for the climax of the picture, Charles Griffith and Mark Hanna hand in a screenplay with a solid premise and engaging characters, and Corman assembles an entertaining thriller with a deadly serious tone.