Jason was born on June 13, 1946 in the small town of Crystal Lake.  His mother is Pamela Voorhees and his father is Eli Voorhees.  Jason was born with hydrocephalus, which is a severe tumor that made his head and face rather ugly, and an abnormally large heart.  As a child, no one spoke or was friends with Jason.  Initially, Jason was considered dead as a child who drowned in the lake, but he was alive all this time and became a maniac, killing people on the orders of his deceased mother. 