Aneta Corsaut
Not only was she really beautiful with a wonderfully expressive face and eyes, she turned in a very heartfelt performance in "The Blob," and has a startling chemistry with Steve McQueen. I watch the film every now and again, and I am always surprised at how fresh and charismatic the two lead performers are. Or, maybe I'm just a sucker for sentimentality! Whatever the case, the scene in which Corsaut convinces McQueen that he "isn't the type to turn his back on what he knows is true" always gets me. It's so sincere and human.
"The Blob" is a very good film in many regards, and the good performances all around (the whole cast is great) only made it better.