The Secret Library

"The Secret Library" is the fifty-seventh upcoming episode of the Disney Junior animated series Sofia the First, which is scheduled to premiere on October 12, 2015.

This will be the first installment of a four-part storyline.

Plot
When Sofia's Aunt Tilly visits Enchancia, she gives Sofia a special book that guides her to a secret library hidden in the castle. The library is filled with hundreds of unfinished books, and Sofia is the only one who can give each story a happy ending. Sofia selects the story of Minimus's brother, Mazzimo, who has been captured by the arrogant and greedy Prince Roderick of Borrea. It's up to Sofia and Minimus to rescue Mazzimo and grant him his one wish: to be free.

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

Trivia

 * In this episode, Merida will be the first and only Pixar character to appear in the series to aid Sofia.
 * 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".
 * This will be the third time Sofia wears her Flying Horseman outfit for a mission. The first time was in "Finding Clover" and the second time was in "Minimus is Missing".
 * 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.
 * 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.