In the Bible...Are they still here?

Ok so I know its silly to believe in super heroes and angle humans and everything. But i started reading Genesis and it talks about Nephilites and how they would be the heroes and renowned men. I also read this book called Hush Hush. Its a love story about a girl that falls in love with a Nephilite and he has powers and junk. now honestly go out and but this book but anyway could these nephilites be real (im a faithful Christian so obviously i no their real because it was in the Bible) and are they among us today?