Nephilim are beings who appear in the Hebrew Bible, specifically in the Book of Genesis, and are also mentioned in other Biblical texts and in some non-canonical Jewish writings.
http://en.wikipedia.org/wiki/Nephilim

Explores the Nephilim of ancient religous texts as an extinct race of Mutant Half breeds. ... The Nephilim ,Biblical Giants , Human/Angel Half breeds?, Human/Alien Half breeds ...
http://www.geocities.com/nephilimnot/nephilim.html

Genesis 6:4 states 'The Nephilim were on the earth in those days --and also afterwards-- when the sons of God went to the daughters of men and had children by them. They were the ...
http://www.pantheon.org/articles/n/nephilim.html

encyclopedia mythica hybrid offspring human females genesis 6 religion resources: Essays, articles, and resources for Nephilim
http://altreligion.about.com/library/bl_nephilim.htm

Amazon.com: Nephilim: The Truth is Here (Nephilim Series Vol. 1): L. A. Marzulli: Books ... Paperback: 464 pages; Publisher: Spiral of Life; Out of print please contact edition ...
http://www.amazon.com/Nephilim-Truth-Here-Vol/dp/0310220114