Once Upon A Time - Episode 3.16 - It's Not Easy Being Green - Info about Wicked Witch - best f y

Viewers will find out the Wicked Witch's backstory on episode 16, titled "It's Not Easy Being Green." Co-creator Adam Horowitz said,

“She’s got a whole backstory and mythology. We used the original [L. Frank Baum] book as a jumping-off point, and then spun her in a hopefully unique, Once Upon a Time way.”

Unfortunately, fans will have to wait until the second to last episode in season 3 to discover the backstory and what her issue with the Evil Queen is