Board Thread:Spoilers!/@comment-1916997-20151229033119/@comment-1916997-20160109152714

Edzz wrote: Now it's starting to look like:

512 - Evil Queen

513 - Snow White/Hercules (with some Evil Queen + Megara)

514 - Rumple

515 - Hook

516 - Zelena (with possible Zelena/Hades Backstory)

517 - Belle

518 - Robin Hood (Based on the fact that he's confirmed to get an episode

519 - Hades (I can't imagine that we wouldn't get one)

520 - Escape from the Underworld with no backstory or Emma backstory

521 - Evil Queen (Because B seasons are Regina's domain)

522/523 - Double Finale, no backstory.

Leaving the Underworld will be earlier than 520 (probably in 516 or 517), based on what they have said. Plus, Mulan and Red still need an episode in your list.