If you're a true-blue Harry Potter fan, you'll know all about Severus Snape (played in the films by the fabulous Alan -- 'Die Hard' -- Rickman) and his real relationship to Harry. If you haven't read all the books, well, never fear, the true reasons why Snape so hates Harry and why he behaves so badly will be revealed by the end of the last installment, 'Harry Potter and the Deathly Hallows, Part 2.'

To tide you over until Friday, when the film opens everywhere (in 3D to boot), Warner Bros. has just released a short featurette about Snape, with cast comments and footage not seen in the trailers.

Check it out after the jump.

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Tip o' the hat to Collider