Alan Rickman almost didn't play Severus Snape in the "Harry Potter" movies ... Snape was a half-blood, born to a Muggle father named Tobias Snape and a witch mother named Eileen Prince.

Not every event in the Harry Potter books can be added in a two and half hour film. While the first couple of movies ... are about. Snape’s Backstory in The Half-Blood Prince Is Never Revealed ...