This movie was the scariest shit I ever saw when I was a kid. I couldn't even watch the whole movie then, I screamed for daddy to turn it off. Years later it's still kinda creepy & thos creatures are just plain nasty looking. Good movie all the way thru. The nasty looking creatures come from some sorta human brain wave experiments, attacking folks by latching onto the back of their heads and sucking out the brain. Yuck, nasty shit for 1958 huh? The monsters are cool looking and well done for the time. Nice plot & a good characters help make this thing believeable and scary. Hold on to your heads folks and watch this gruesome oldie late at night with the lights down low.