The plot of Heroes of Might and Magic V.

There is no Freya and Alaric in duel mode at all, but you can find more details about Heroes 5.5 in the relevant topic.

But it does exist. I couldn't find that picture, but here is http://i.ytimg.com/vi/W-W2d4ou-0k/0.jpg.
And similarly to this, I want to be able to choose all heroes from the Campaigns in a single player game. How can I do this?
And which is better, 5.5 or 3.3? I have read about the technical aspects.