Fans of “101 Dalmatians” and “The Little Mermaid” won’t want to miss “Once Upon a Time.” The ABC series is adding two more Disney villains into the Season 4 mix – Cruella de Vil and Ursula.

Season 4 of  “Once Upon a Time” has heavily focused on Disney’s 2013 hit, “Frozen.” However the series will be introducing a new set of problems for Emma (Jennifer Morrison), Mary Margaret (Ginnifer Goodwin), David (Josh Dallas) and the rest of the heroes to face when Cruella de Vil and Ursula storm Storybrooke.

As we reported in early November, actress Victoria Smurfit confirmed on Twitter that she’d be joining the ABC series as “101 Dalmatians” villain Cruella de Vil. But as quickly as she tweeted it, she swiftly removed it from her social media page.

Known for her black and white hair, fans of the 1961 animated film remember Cruella de Vil as a woman who wanted to use Dalmatian puppies to make a unique fur coat. Details on the character’s involvement on “Once Upon a Time” are being kept under wraps, but TV Line noted last month that fans have spotted a Dalmatian puppy on set with Emilie de Ravin, the actress behind Belle.

A few weeks later, Entertainment Weekly was able to confirm that “Alias” alum Merrin Dungey was cast as “The Little Mermaid” villain, Ursula. “Once Upon a Time” viewers were introduced to the character in Season 3, thanks to a storyline involving Ariel (JoAnna Garcia Swish). However the “real” Ursula didn’t make an appearance. Instead, fans will remember that the Evil Queen (Lana Parrilla) impersonated the Sea Witch in order to catch Snow White (Ginnifer Goodwin) once and for all. Originally voiced by Yvette Nicole Brown, Ursula was believed to just be a legend. But Ursula made sure the Evil Queen knew who she was messing with when she threatened her via her magic mirror.

“Next time you claim to be me, you’ll find out just how real I am,” Ursula warned the Evil Queen.

Just like Victoria Smurfit’s Cruella de Vil, Merrin Dungey’s role as Ursula on “Once Upon a Time” is being kept a mystery. However EW does note that the pair will be teaming up with Kristin Bauer van Straten’s “Sleeping Beauty” villain, Maleficent.

Fortunately, viewers don’t have to wait too long to see the Disney villains on screen. Cruella de Vil is rumored to first appear in the midseason finale of “Once Upon a Time,” and fans have spotted the character on set with Ursula.

Check out the photos that “Once Upon a Time” fans are tweeting of Cruella de Vil and Ursula in Storybrooke: