Sisters

"No matter what she does, we're sisters! And nothing can change that! I will find you! I promise!"

- Regina to Zelena

"Sisters" is the nineteenth episode of Season Five of ABC's Once Upon a Time. It was written by David H. Goodman and Brigitte Hales, and directed by Romeo Tirone. It is the one-hundredth and seventh episode of the series overall, and premiered on April 24, 2016.

Synopsis
Now that Hades and Zelena are reunited, Hades tells Zelena that he wants a future with her outside of the Underworld. All she needs to do is heal his heart with True Love’s Kiss so they can leave the Underworld and trap the heroes there for eternity. When Regina overhears of this plan, she enlists Cora's help to find a way to separate Zelena from Hades. However, Cora reveals a family secret that could change Regina and Zelena's lives forever. Meanwhile, David finally meets James, only to realize that his twin is determined to seek revenge on him for stealing the life he could have had.

Starring

 * Ginnifer Goodwin (Credit only)
 * Jennifer Morrison as Emma Swan
 * Lana Parrilla as Regina Mills
 * Josh Dallas as David Nolan
 * Emilie de Ravin as Belle French
 * Colin O'Donoghue as Hook
 * Jared S. Gilmore as Henry Mills
 * Rebecca Mader as Zelena
 * Sean Maguire as Robin Hood
 * Robert Carlyle as Mr. Gold

Guest Starring

 * Greg Germann as Hades
 * Barbara Hershey as Cora
 * Robbie A. Kay as Peter Pan
 * Tony Perez as Valet
 * Victoria Smurfit as Cruella De Vil
 * Ava Acres as Young Regina
 * Isabella Blake-Thomas as Young Zelena
 * Adrian Hough as Woodcutter

Co-Starring

 * Romuald Hivert as Guard

Uncredited

 * Unknown baby as Baby Hood
 * Josh Dallas as Prince James

Trivia
Production Notes=

Production Notes
Episode Connections=
 * The title card features the Underground Mill.
 * This episode is dedicated in loving memory of Scott Nimerfro, who passed away on April 18th, 2016, six days prior to the episode's airing.
 * The title of this episode is a reference to the Season Four episode "Mother", which revolved around Regina's relationship with her mother, Cora.
 * Ava Acres, who plays young Regina, put on her own make-up for the dress-up scene with young Zelena.
 * According to Ava Acres, Barbara Hershey hugged her after every take of having to yell at her.

Event Chronology

 * The Underworld events take place after "Ruby Slippers".
 * The Enchanted Forest events take place years after "The Miller's Daughter", and years before "The Stable Boy".
 * The Oz events take place years after the first flashback scene of "It's Not Easy Being Green", and years before the rest of "It's Not Easy Being Green" flashbacks.

Episode Connections

 * The history between Zelena and Hades is first explored in "Our Decay".
 * Cora was made to work in the Mill in "Souls of the Departed".
 * Cora first questioned how Hades found out about Zelena in "Souls of the Departed".
 * Belle French went under a Sleeping Curse in "Ruby Slippers".
 * Cruella was killed by Emma in "Sympathy for the De Vil".
 * Cora mentions to Zelena what she did to Regina's father in "Souls of the Departed".
 * Peter Pan first proposed his deal to Mr. Gold in "Souls of the Departed".
 * Mr. Gold made a deal with Zelena to stop trying to harm her in "Heart of Gold".
 * -|Cultural References=

Fairytales and Folklore

 * This episode features the Evil Queen from the Snow White fairytale, the Wicked Witch of the West from The Wonderful Wizard of Oz story, the Miller's Daughter from the Rumpelstiltskin fairytale, Captain Hook and Peter Pan from the Peter Pan story, Robin Hood from the ballad, the Prince from The Prince and the Pauper story, Cruella De Vil from The Hundred and One Dalmatians story, and Hades from Greek Mythology.
 * Also featured is the Underworld and the river Lethe (the latter is correctly referred to as the River of Forgetfulness) from Greek Mythology.

Lost

 * The number 15 appears on a pavement sign outside the Underbrooke version of the Marine Garage; a reference to the third Lost number.

Pop Culture

 * The way Zelena asks Cora if she is a "good witch" is a reference to the 1939 film The Wizard of Oz.
 * The song "I Don't Want to Set the World on Fire" by The Ink Spots plays in Hades' car radio during his date with Zelena. Hades plays the song again on the Underbrooke Diner's jukebox, as he prepares for another date.
 * -|Other Notes=

Filming Locations

 * Zelena's date with Hades, was filmed in Garry Point Park, a large 75 acre waterfront park located close to Steveston Village, which doubles as Storybrooke and Underbrooke on Once Upon a Time.
 * Burnaby's Central Park doubles as the Underbrooke Woods for this episode.