Board Thread:Spoilers!/@comment-1916997-20151229033119/@comment-4453062-20160211191410

My guesses

520 - Either Robin or another Snow/Charming episode. Robin is the only regular without a centric this Season, so it would make sense for him to get one. However, Snow and/or Charming haven't

521 - Hades' backstory, though that could be saved for the finale.

522/523 - Ensemble for the most part, but won't at all be surprised if Emma and Hook have a large role. Saving Hook is one of the main driving factors for 5B, and Hook is the one featured on 5B's poster. Maybe the Camelot characters and Merida will have their resolution as a part of the finale, too? Perhaps the main gang returns from the Underworld, only to find that Arthur was set free by Guinevere, and is in the middle of making Storybrooke the new Camelot as he had planned. Instead of the finale taking center stage in the Enchanted Forest like the last 2 Seasons, the main action could take place in Storybrooke this time around. Hades could of course pursue them back to Storybrooke, adding another conundrum.Therefore, the finale could be the battle to save Storybrooke.