The Secret Library

"The Secret Library" is an upcoming multi-part episode of the Disney Junior animated series Sofia the First. The first episode of the four-part story arc is scheduled to premiere on October 12, 2015.

Plot
Sofia and her step siblings are having a flying derby race outside the castle. Suddenly Aunt Tilly arrives and pays a visit. In the castle, Aunt Tilly tells Sofia to read the book she gave until Chapter Seventeen which is her favorite. Sofia read the book and finds a secret blue book that leads somewhere. Sofia's amulet glows blue and Clover has found a way in to it. She used her shrinking spell to get in then back to normal, She rides on a magical boat with references to Disney Princesses. She reaches the gate to The Secret Library of Enchancia where many books stored have missing pages. Aunt Tilly welcomes her and the library chose her first story called The Tale of Wildwing Valley.

Minimus's brother Mazzimo wishes to be free in Wildwing Valley. He left him and his parents behind. On the way, He was captured by the greedy Prince Roderick of Borrea.

After the story, Aunt Tilly tells her to find a better ending which is to free him from Prince Roderick and grant his wish. Sofia rushed to Minimus to rescue Mazzimo with Aunt Tilly and her flying horse Athena. They have reached the Borrean Castle. There Mazzimo was caged in a stable. As Sofia and Minimus sneak and find him, Only to make Minimus angry. Suddenly Prince Roderick arrives with his stable master Gavin. Sofia tells him that Mazzimo doesn't like the stable and wished to be free. Roderick later plans to test fly him but Aunt Tilly intervenes, Mazzimo flies away. Roderick and Gavin chase them, on the way Sofia fell while Minimus and Mazzimo argue, and Aunt Tilly catches her, thus losing her bag. Minimus and Mazzimo were later captured. While Aunt Tilly and Sofia find the bag Sofia was doubtful. Her amulet glows and Merida was summoned to help. Through a song she sings how doubtful she is and later she can save Minimus and Mazzimo. As Roderick and Gavin go back to the castle Sofia frees Minimus and defeats Prince Roderick in an umbrella. Minimus later frees Mazzimo at last, Aunt Tilly found her bag and head to Glittering Gorge, Tempest and Ellegra want to join them leaving Roderick and Gavin. They have arrived at Wildwing Valley and Mazzimo was welcomed by his friends. Sofia, Aunt Tilly and Minimus bid goodbye and ending the story.

Back in the library, Her first story was complete. Sofia will do the next story...

Cast

 * Ariel Winter as Sofia
 * Bonnie Hunt as Aunt Tilly
 * Eric Stonestreet as Minimus
 * Ruth Connell as Merida
 * Cary Elwes as Prince Roderick
 * Hugh Bonneville as The Narrator
 * Dean Norris as Mazzimo
 * Wayne Brady as Clover
 * Fred Tatasciore as Gavin
 * Abigail Mavity as Tempest
 * Grey Griffin as Ellegra
 * Jessecia St. Clair as Athena

Song

 * Save The Day

Trivia

 * In this episode, Merida will be the first and only Pixar character to appear in the series to aid Sofia.
 * Bonnie Hunt is known for her Pixar roles, and Merida was right next to Tilly in the end of "Save the Day."
 * This will be the fifth time Sofia and Minimus go off on a mission together. The first four times were in "Finding Clover", "Princess Butterfly", "The Leafsong Festival" and "Carol of the Arrow".
 * Sofia wears a new Derby Race outfit in this episode.
 * Tilly is revealed to have a flying horse named Athena in this episode.
 * Instead of being voiced by Kelly Macdonald, Merida will be voiced by Ruth Connell who provided her voice in the Disney INFINITY game series.
 * Prince Roderick will be the second villainous prince on the show, the first being Prince Hugo.
 * Merida will be the tenth Disney Princess to appear on the show.
 * ​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".
 * The fourth was Ariel in Sofia the First: The Floating Palace.
 * The fifth was Aurora in "Holiday in Enchancia".
 * The sixth was Snow White in "The Enchanted Feast".
 * The seventh was Mulan in "Princesses to the Rescue!".
 * The eighth was Rapunzel in Sofia the First: The Curse of Princess Ivy.
 * The ninth was Tiana in "Winter's Gift".
 * ​Merida will be the second non-traditional animated Princess to appear on the show. The first was Rapunzel.
 * Merida is the third princess to not sing after Aurora and Snow White.
 * Merida is the third Princess after Jasmine and Mulan that doesn't disappear magically after aiding Sofia.
 * Merida is the third Disney Princess not to be shown in her redesign, instead wearing her normal princess dress. The first two was Ariel and Mulan.
 * Tilly will ride a flying horse for the first time in this episode.
 * Tilly will meet a Disney Princess for the first time in this episode
 * This will be the first multi-part episode in the series.
 * Cary Elwes, who will voice Prince Roderick, is also known for his portrayal of Lawrence Gordon in the Saw Series, Wesley in The Princess Bride, Captain William Boone in the 1994 live action Jungle Book and the titular character in the Mel Brooks film Robin Hood: Men in Tights.
 * It is revealed in this episode that the Amulet of Avalor has the ability to act as a compass to the Secret Library when the one wearing it has the magical book that's the Secret Library's key. Unlike the Amulet's other abilities, which make the amulet give off a purple glow, this ability makes the amulet glow blue.
 * Sofia will use her shrinking ability for the second time in this episode.
 * Tilly will reveal she knows the truth of Sofia's Amulet due to being the last person who wore it before her.
 * Minimus will be revealed to have a brother named Mazzimo.
 * This is the second episode to be narrated the first being Once Upon a Princess.
 * This is the fourth episode which has a different background in the credits, the others being "Holiday in Enchancia", "Ghostly Gala" and "Winter's Gift".