Ginnifer Goodwin, Rebecca Mader

Zelena is wasting no time taking down the Charming family!

On Sunday's episode of Once Upon a Time, the Wicked Witch (Rebecca Mader) has tricked Snow White (Ginnifer Goodwin) and Prince Charming (Josh Dallas) into letting her in their home under the guise that she's helping with the upcoming pregnancy. But Zelena has something much more sinister planned for Charming when she tries to poison him! Check out an exclusive sneak peek at Sunday's episode:

Once Upon a Time: The Wicked Witch's true identity revealed!

Once Upon a Time airs Sundays at 8/7c on ABC.