It looks like we might find out about Zelena's back story in "It's Not Easy Being Green"
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Zelena's having a little too much fun wielding that dagger over Rumpelstiltskin. We can't wait to see the day it backfires.
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How scared should David and Mary Margaret be about Zelena's interest in their unborn child?
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Can Emma protect her new baby brother or sister from the Wicked Witch?
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With Rumpelstiltskin as Zelena's slave, the rest of Storybrooke may be in big trouble.
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So when do you think Zelena will share the news with Regina that they're really sisters?
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From the look on her face, we'd say that Zelena has some serious ange issues to work out.
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Things are definitely not going well for Regina now that Zelena has come out of hiding. "It's Not Easy Being Green" is the 16th episode of the show's third season.
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Once Upon a Time Quotes

Someone once told me to act like what you plan to be so I try to act a little better than I am.

Cora

Snow: Maybe it's a tiny collander.
Regina: Yes, because pre-teen Baelfire probably made lots of pasta.