For me, it definitely has to be Episode III: Revenge of the Sith. I went to see it five times in the cinemas and I cried through the first two. It is definitely a powerful addition to the saga and it was so satisfying to see Anakin become Darth Vader and finally link the PT to the OT.
There is no emotion, there is peace
There is no ignorance, there is knowledge
There is no passion, there is serenity
There is no chaos, there is harmony
There is no death, there is the Force.
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