Frank Tuttle who was a contract director at Paramount and most famous for This Gun For Hire ended his directorial career on a sad note. A blacklist victim, Tuttle's last film was Island Of Lost Women. It should be added that their dad was with them.
In fact Alan Napier who is the dad is responsible for building an island paradise for his three daughters who since the mid 40s have been growing up and filling out quite nicely. The daughters are Venetia Stevenson, Diane Jergens, and June Blair. Like Anne Francis in Forbidden Planet they've been educated in a lot of areas except the facts of life, no avenues for practical experience and home work.
Into their lives come Jeff Richards and John Smith, a pair of healthy American males who get themselves lost when their plane conks out and they land on the beach. Even with those three girls for company, Alan Napier doesn't want them around. Napier was a nuclear scientist who saw the world destructing itself and he was going to get away from it all. He's even developed workable and practical solar energy and what we wouldn't give to have that about now.
The story was kind of dumb even a smart guy like Napier couldn't keep those daughters of his from getting curious about the world. Special effects were laughable, especially with Jeff Richards knife in hand wrestling with a rubber shark.
Paradise does come to an end in Island Of Lost Women and not to soon.