The Floating Palace

Sofia the First: The Floating Palace is a Sofia the First special that aired November 24, 2013 on the Disney Channel as a Family Night special event.

Plot
Somewhere travelling across the sea aboard a boat known as The Floating Palace, Sofia is in the library reading a story when the royal family arrives at a tropical island known as Merroway Cove for a vacation. Also accompanying the Royal family is Cedric who is out on another scheme to take over the kingdom only this time he's not after the Amulet of Avalor.

On the swimming deck Sofia spots a young mermaid who gets herself tangled in a fishing net. Sofia helps the young mermaid also known as Oona get untangled only to have a hurt fin. Then to their amazement, Sofia's amulet grants her the power to turn into a mermaid. Happy with her new powers, Sofia decides to head down below and help Oona return home.

Oona takes Sofia to a shipwreck, that she calls her hideaway and they meet her friend Sven, a seahorse and her older sister, Cora. Cora wraps Oona's sore fin with seaweed and later they go to Oona's castle where they meet her mother, Queen Emmaline. It turns out the Merpeople of Merroway Cove are not pleased with the arrival of the Floating Palace and show they have a dislike for humans, saying they're dangerous.

Sofia admits she's a human too and promises to convince her family to move their Floating Palace. However her family and not even the captain of the Palace believe her that mermaids exist.

Things get worse when Cedric who has transformed himself into a sea monster, captures Oona for her magic hair comb. Sofia returns to warn Queen Emmaline of her young daughter's kidnapping but Plank informs Sofia that sea monsters do not exist. Instead he believes that Sofia's family has kidnapped Oona. Queen Emmaline warns Sofia if she does not return her daughter before sundown, she will sink the ship with her family on it by creating a massive storm.

Sofia goes back to the Floating Palace to warn them but to no avail. So its now up to her and her animal friends Clover, Farley and Sven to find the Sea Monster Cedric and rescue Oona but they fail.

Sofia feels terrible because she failed to save Oona and her family will be drowned for a crime they never committed. As all hope seems lost, Sofia's amulet summons Princess Ariel. Through a song, Ariel convinces Sofia not to give up and this is when she decides to go find Cora for help. At first Cora refuses to believe what she says until Sven steps froward.

Meanwhile Emmaline uses her trident to create a giant storm to sink the Floating Palace. While this goes on, Sofia and her friends find where Sea Monster Cedric is holding Oona and with help from Cora she gains possession of Oona's comb and uses it to rid of Cedric. Oona reunites with her family and Emmaline puts an end to the storm with deep apologies to Sofia.

As the sun sets, Sofia's family finally gets to meet the Merpeople and Sofia and Oona are able to stay as friends.

Songs

 * Merroway Cove
 * The Love We Share

Cast

 * Ariel Winter as Sofia
 * Sara Ramirez as Queen Miranda
 * Wayne Brady as Clover
 * Tim Gunn as Baileywick
 * Darcy Rose Byrnes as Princess Amber
 * Zach Callison as Prince James
 * Travis Willingham as King Roland II
 * Kiernan Shipka as Oona
 * Jodi Benson as Ariel and Queen Emmaline
 * Jeff Bennett as Farley
 * John Ross Bowie as Sven
 * Phil Morris as Plank
 * Sarah Mitchell as Cora
 * Jess Harnell as Cedric the Sorcerer
 * Jim Cummings as Wormwood

Trivia

 * This is the second time a Disney Princess shows up in a special (Cinderella) and the second special of the show (Sofia the First: Once Upon a Princess).
 * This is the third time Sofia undergoes a magical transformation. In "Cedric's Apprentice", she became a lizard. In "The Amulet and the Anthem", her voice became that of a frog's.
 * This is the second time Sofia strengthens ties between her family and supernatural creatures. Before, it was the trolls in the episode "Let The Good Times Troll."
 * Ariel is the fourth Disney Princess to assist Sofia.
 * The first was Cinderella in Sofia the First: Once Upon a Princess.
 * The second was Jasmine in "Two to Tangu".
 * The third was Belle in "The Amulet and the Anthem".
 * When Oona asks what kind of animal Clover is, he says "I'm a Blue Ribbon Bunny," a reference to the song and the seventh episode.
 * Oona, in many ways, is similar to Ariel. She is the youngest, treated like a "mer-baby" by the older sibling and parent, her mother and Plank possess a dislike for humans, and she is rarely taken seriously because of how young she is.
 * The timeline of the series seems to be falling into a year since Sofia became a princess. Jade stated in "The Little Witch" that Lucinda arrived a few months after Sofia left. "Princess Butterfly" took place on Halloween, "Great Aunt-Venture" in November (most likely) and now a vacation, followed by winter holidays.
 * This episode could be considered a filler episode. (An episode that pertains to the series but not the main timeline or storyline.) The episode takes place during the summer. "Great Aunt-Venture," the previous episode, in the fall.
 * This is the second episode where Cedric doesn't go after the Amulet, the first episode was "Tea for Too Many".
 * Cedric undergoes a magical transformation for the first time in the series and so does Wormwood.
 * This is the second time Cedric not only doesn't go after the Amulet, but also doesn't want to take over Enchancia. The first time was in Tea for Too Many. For the first time he's going after a different kingdom, showing Cedric wishes to rule a kingdom, but has little preference for which one. An opportunistic persona.