The closest thing to the Saga is the EPIC, which is also in chronological order, with some deleted scenes.
However, I must be honest by saying that although it is nice every once in a while to watch the Saga and The Epic in chronological order, Godfather II is really meant to be watched on it's own, with the flashback scenes, as they coordinate with what is going on in Michael's life and what went on in young Vito's life.
But the EPIC is the the closest thing to the Saga, uncensored and uncut, as your going to get.
Don Cardi
