"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.
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.
- The title card features the Underground Mill.
- The title of this episode was announced by Adam Horowitz via his Twitter account on February 5, 2016.
- The title of this episode is a reference to the Season Four episode "Mother", which revolved around Regina's relationship with her mother, Cora.
- 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.
- Regina names her doll Isabella, which is the same first name as Isabella Blake-Thomas, young Zelena's actress. This is especially appropriate since Regina tells the doll that she can be her sister. In addition, Ava Acres, who plays young Regina, has an older sister named Isabella.
- Isabella Blake-Thomas' hair was dyed red to match her older self.
- Ava Acres 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.
- The Underworld events take place after "Ruby Slippers" and before "Firebird".
- The Enchanted Forest events take place years after "The Miller's Daughter", and years before "The Stable Boy". (For more details, see the Enchanted Forest timeline)
- 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.
- The history between Zelena and Hades is first explored in "Our Decay".
- Zelena once again shows her ability to conjure green fire, she used this first in "Our Decay".
- Mary Margaret and David swapped names on the headstones in "Ruby Slippers".
- Cora was made to work in the mill in "Souls of the Departed".
- Cora uses Hook's hook to remove the cuff from her wrist. His hook was also used to remove Zelena's cuff in "Broken Heart".
- Cora first questioned how Hades found out about Zelena in "Souls of the Departed".
- Belle French went under a Sleeping Curse in "Ruby Slippers".
- David first learnt of James' resentment towards him in "The Brothers Jones".
- The framed photograph that Emma is looking at, which she says was taken during her parents' wedding anniversary, is the same photograph that she showed Regina in "Labor of Love".
- Cruella was killed by Emma in "Sympathy for the De Vil".
- Hook points out that Cruella cannot use a gun, referring to how Isaac used his quill to take away her ability to kill 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".
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.
- The number 15 appears on a pavement sign outside the Underbrooke version of the Marine Garage; a reference to the third Lost number.
- 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.
- When Cora opens the Book of Spells, one of the illustrations is a slightly modified, upside-down version of the seal of Marbas, an illustration from the Lesser Key of Solomon, a spell book on demonology published in the 17th century. Marbas is a demon who is described as the Great President of Hell, governing thirty-six legions of demons.
- At the Underbrooke Docks, when James gets up after David pushes him to the ground, in the background, you can see the Enchanted Cuff lying on the ground next to Emma and Hook, indicating that Hook used his hook to remove it from Emma's wrist off-screen, just like Cora used it to remove her own cuff earlier in the episode.
- 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.
- The exterior of the Woodcutter's cottage is a redressed version of the Apprentice's cottage from previous episodes, and Brennan's cottage from "Swan Song". Although the set has been heavily redressed to double as the Woodcutter's home (most noticeably, the roof has a completely different shape, and the chimney is in a different position), the door, the window panes and the pattern of the brick stones (the ones around the window are easiest to compare) are the same.
- Burnaby's Central Park doubles as the Underbrooke Woods for this episode.
|French||"Le Temps des Adieux"||"The Time for Goodbyes"|