Credit: Jack Rowand/ABC

We’ll admit that we were a little disappointed to only see the Wicked Witch (Rebecca Mader) for a few minutes at the tail end of Season 3, Episode 12 (“New York City Serenade”) — but next week looks like it’ll be a big one for the new Once Upon a Time baddie. The promo for Season 3, Episode 13 (“Witch Hunt”) is giving us all kinds of emotions about Regina (Lana Parrilla) and Zelena’s eventual faceoff.

Lana spoke to E! Online about the reason why Zelena is looking super green and teased that we will soon learn about the evil gal’s background.

“There’s some real deep-rooted issues there, with this Zelena character,” Lana teased. “It manifests in jealousy, it comes out in envy, but there’s some deeper issues there that I can’t share with you.”

Hmm, we’ve been tossing around the idea that perhaps Regina and Zelena might be related. And since Lana couldn’t divulge any other info about the “deeper issues” at play, we’re inclined to think of that as a huge hint.

Either way, it’s clear that the Wicked Witch has it out for Regina. Not only will they face off in future episodes, but she sent her flying monkey minion to get a few drops of Regina’s blood for her to use in a potion. What’s the potion for? Why does she want to hurt Regina? We need answers, people!

What do you think is happening between Regina and Zelena? Hit the comments and speculate away!

Once Upon a Time airs Sunday nights at 8 p.m. ET on ABC.

Carson Blackwelder is an Assistant Editor at Wetpaint Entertainment. Follow him on Twitter and Google+!