So yes, that means more Outlaw Queen romance and baby-mama drama (hopefully)!
Maguire made his first appearance as the famous thief in Once's Season 3 premiere and has since become Regina's true love (though not before plenty of roadblocks). That year, Mader also burst onto the Storybrooke scene and continued wreaking some seriously green havoc as Zelena (a.k.a. the Wicked Witch of the West), even after she supposedly died at the end of that season.
But wait! In true witchy fashion, some essence of Zelena survived and after a convoluted sequence of events she came back disguised as Robin's wife Marian and then proceeded to have marital relations with him. Unfortunately, even though Regina revealed her half-sister's deception, it was too late: Zelena is now pregnant with Robin's child. No doubt Season 5 will explore that complicated relationship between the embattled sisters and Robin — with a typical Once twist!
TVLine also reports that Once is getting ready to dive into some Camelot lore after revealing in the Season 4 finale that the only person who can save the newly appointed Dark One, Emma, is Merlin.
In addition to casting the famed sorcerer (who according to Disney's The Sword and the Stone is hanging out in Bermuda), the drama will also introduce King Arthur and Guinevere in heavily recurring roles. Here's what the network is looking for and what we can expect:
Merlin - ABC is currently looking for a black Brit in his early 30s to early 40s to play Merlin, "a man with great wisdom and intelligence beyond his years" who has always put duty in front of his own desires even at a great personal cost.
Arthur - The legendary king is being described as a "good and just ruler," though below his facade "is a master manipulator who can carry a grudge to the grave, and maybe beyond." Uh, that definitely sounds like this show! He also harbors an "eternal burning love" for Guinevere. Again, that British accent is a must.
Guinevere - ABC is looking for a Latina in her mid-20s to mid-30s to play the "headstrong queen" who fell in love with her husband's most trusted knight, Lancelot. She must now balance her own happiness with the well-being of Camelot.
Now that you know who ABC is looking for, who would you cast as Merlin, Arthur and Guinevere?
VIDEO: The Once Upon a Time cast shares their characters' ultimate happy endings