Though the Snow Queen refuses to reveal her true intentions, Regina and Emma have no problem confronting their issues with one another on this week’s “Once Upon a Time.”

The episode opens in the Snow Queen’s lair as she stands over an undistinguishable frozen body.

Meanwhile, Emma and Elsa continue to search through files at the Sheriff’s station for signs of Anna. Elsa insists that they confront the Snow Queen. Emma says they would if they knew where to find her, and they still need to figure out how the Snow Queen knows both of them without them remembering her. Emma is convinced that she took their memories because there’s no way she’d ever forget. Hook brings in files from the Mayor’s office just as Will Scarlet – still in a cell at the station – reminds every one of his presence. Hook starts to leave because he’s going to take Henry sailing and Will makes a remark about Hook trying to use Henry to impress Emma. Hook suggests that he keep his thoughts to himself and kisses Emma goodbye.

Elsa comes across the photos that Regina took of Emma and Henry when she first arrived and Regina wanted her to leave. As Emma flips through the photos, she finds one of her talking to the Snow Queen in her ice cream shop. Emma doesn’t remember them being taken, but hopes that the person who had them taken might know something.

Regina is going through spells and magic ingredients in her vault when Sidney appears in the mirror. She demands that he find the Snow Queen so she can force her to unfreeze Marian.

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As Belle holds baby Neal in Mary Margaret and David’s apartment – proving to be a natural at babysitting – David convinces Mary Margaret to leave the baby for a little while and give herself a much need break.

Elsa and Emma drive up to where Regina’s vault is and Emma hesitates. She explains to Elsa that the photos remind her of her arrival to town, a time when she and Regina “did not mix.” She also admits that they might be right back where they started since Emma brought Marian back. Elsa suggests that Emma talk to Regina alone.

In a flashback to Hopkins, Minnesota in 1998, teenage Emma is caught shoplifting in a grocery store. A girl that Emma has never met before interjects and gets Emma out of trouble. When they leave the store, the girl tells Emma to run as several vans start chasing them. They avoid their pursuers and the girl introduces herself as Lily.

Emma enters the vault to a not-so-warm welcome from Regina. She shows Regina the photos and Regina says she doesn’t know why Emma would be talking to the Snow Queen. Emma decides that she should ask Sidney because he took them, but doesn’t know where to find them. Regina denies knowing where he is and says she needs to get back to finding a way to save Marian. Emma offers to help, but Regina rejects the offer.

Back in Emma’s car, Elsa hears her name being yelled in the distance. As the voice gets louder, it starts to sound like Anna and a figure walks toward Elsa and Elsa starts walking to meet it. Emma comes out of the vault to find that Elsa has disappeared.

Down in the vault, Sidney appears to tell Regina that he’s found the Snow Queen’s lair. He refuses to tell her where it is until she releases him from the mirror, but she refuses to give him freedom until his information proves helpful. She threatens to put him back in his cell instead of the mirror and he decides to give her the information she wants.

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David and Mary Margaret stop by the Sheriff’s station before their walk. She insists that they be reachable by Belle at all times, so David grabs a radio and says he will tell Belle where to find the one at their apartment. As they’re about to leave, David notices that Will is no longer in his cell. David suggests they go look for him, telling her it’ll be like their old adventures – minus the Evil Queen.

As Regina makes her way through the woods – following Sidney’s directions to the Snow Queen from a hand mirror – she runs into Emma, who is looking for Elsa. Regina reveals her plan to force the Snow Queen to unfreeze Marian. Emma asks Regina if she can come with and Regina reluctantly agrees, saying that Emma will come regardless of her giving permission.

Back in Minnesota, Emma and Lily get to know each other. Emma tells Lily that she left her foster home in Boston because she’s too old to be adopted and was tired of feeling invisible. Lily tells her that she understands how it feels to be invisible because she’s also avoiding foster care. They decide to stick together and squat in a nearby house.

Elsa continues to chase Anna’s voice. She reaches a cliff edge and sees Anna on the other side. She builds a staircase of ice for herself to walk across, but when she moves forward, Anna disappears.

Mary Margaret and David are looking for Will when Mary Margaret says that she’s been away from the baby for too long. David tells her to go home and that he will find Will. Mary Margaret starts to head home, but sees someone digging a hole in the distance. At first, she thinks she seeing things, but then realizes that she needs to check it out.

While looking for the Snow Queen’s lair, Emma tries to make amends with Regina, but Regina keeps pushing her away. She accuses Emma of trying to assuage her own guilt over bringing Marian back. She says that whether it was intentional or not, Emma ruined Regina’s life and there’s no coming back from that. She advises Emma to do what she does and learn to live with what she’s done. “Welcome to my world,” Regina adds and keeps walking.

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Lily and Emma break into the house they plan to occupy. Settling into some video games, Emma notices that Lily has a star-shaped scar on her wrist. Lily says she’s had it for as long as she can remember and doesn’t know where it came from. Emma tells her that it makes her special and Lily draws the same mark on Emma’s wrist to tell her that she’s special too. They find a video camera in the house and take a short video of themselves laughing and smiling. Lily then makes Emma promise that they will always be friends and that there will never be anything that their friendship can’t come back from.

Elsa finally finds Anna – and the Snow Queen. Anna disappears and the Snow Queen tells her that she was never really there as she places icy shackles around Elsa’s wrists. The Snow Queen tells Elsa that she is crippled by fear of her powers and that Elsa could be so powerful if only she learned how to control her abilities. She says that Elsa had an opportunity once, but she “squandered it.” The chains around Elsa’s wrists will only grow stronger with her fear – which is exactly what the Snow Queen wants. She wants Elsa to stay out of her way. For what? The Snow Queen is “going to build a snowman.”

Mary Margaret confronts Will as he frantically digs holes in the ground. He says that he looking for something, but unfortunately, he buried the map with the thing he’s looking for – done after having a little too much to drink. Suddenly, Mary Margaret is convinced that David let him out of his cell so that she could have an adventure in finding him. As mayor, she offers to pardon him if he admits that David let him out, which he does immediately.

Regina and Emma find Elsa’s staircase over the cliff edge and while Emma is hesitant about its safety, Regina immediately begins walking across. Emma follows but soon senses that something isn’t right. The wind is blowing and the bridge starts shaking. They realize that the Snow Queen found them and Regina knows exactly how: Sidney.

Lily and Emma are sleeping in the house when Emma hears someone break in. She wakes Lily and tells her to run. A man calls Lily’s name and Emma confronts him, telling him to leave Lily alone. As it turns out, the man is Lily’s father and Lily ran away from her home and her family.

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Emma realizes that Regina lied about knowing where Sidney was. Regina says she doesn’t have to tell Emma about everything she does and as she opens her hand mirror, Sidney tells Regina that he doesn’t have to tell her either.  Sidney warns that the Snow Queen has a present for her that is well-deserved. At that moment, the staircase starts collapsing and Emma and Regina try to outrun it.

Elsa struggles with her chains, but realizing that she’s getting nowhere, begins to calm herself down. Once she realizes that she is no longer afraid, she’s able to remove her chains.

Regina and Emma climb onto the cliff to find a big ice snowman – more like soldier – to deal with.

As Lily’s dad talks to the police, Lily tells Emma that she was an orphan who was adopted by a family, but everything else she told Emma was true. She tells Emma to come find her when the situation blows over and says they can run away together. Emma walks away and wipes the star drawing off her wrist.

Regina and Emma position themselves to fight off the Snow Queen’s creation. None of their singular attempts at defeating it with magic are working. Emma suggests that they try again – together – and they are able to melt it away. Their celebration is cut short by the arrival of the Snow Queen. She thanks Regina for bringing her what she needed and takes Regina’s mirror. She starts torturing Regina and Emma, but is soon blown back by Elsa – who insists that the Snow Queen fight her. When the Snow Queen gets up, she congratulates Elsa on overcoming some of her fear. Regina cuts in to say that they should finish their fight, but the Snow Queen says she already got what she needed and disappears.

Emma immediately confronts Regina about not telling her about Sidney. Regina says that they’re not partners and she doesn’t have to tell her anything. As their argument continues, Elsa tells them they need to resolve their differences or “Storybrooke doesn’t stand a chance.” But Regina says they never will – because she doesn’t want to.

Per their agreement, the Snow Queen releases Sidney from the mirror. He thanks her and asks what she’d like him to do. She says that she wants nothing from him, she only ever wanted Regina’s mirror. “Mirrors reflect our mood, our desire, our essence,” she tells him. Though she has tons of mirrors, she tells him that she needed that specific mirror for what she wants to do. She said that Regina has put a lot of dark magic in the mirror and it will help her get what she deserves. When Sidney asks that that is, she says it’s between her and her reflection. She tells Sidney to enjoy his freedom and opens her lair for him to leave – but not before advising him to “get a warm coat” for what lies ahead.

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The Snow Queen then breaks Regina’s mirror and uses a piece of it to repair a larger mirror in her lair, saying that she’s “so close” to what she wants: a family that loves her.

As Elsa and Emma walk home, Elsa explains that she ran off because the Snow Queen tricked her into thinking Anna was there. She then asks Emma why she let Regina leave during their fight. Emma insists that Regina will never forgive her, but Elsa tells her to never give up on the people that are important to her.

Emma finds Regina in her vault. She tells her about Lily and how she regrets giving up on her. Though she loves having her parents and her son in Storybrooke, she says that nobody understands her history of rejection and being misunderstood like Regina does. She says she never wanted Regina to “assuage her guilt,” she just wanted Regina to be her friend. Regina seems surprised that Emma thought they were friends and her anger lessens. Emma tells her that she’ll never give up on her, even when Regina wants to kill her. As she leaves, Regina stops her to say that she doesn’t want to kill her – which Emma says is “a start.”

Back at their apartment, Mary Margaret jokes with David about tracking down Will Scarlet, but it soon becomes clear that David did not let him out on purpose. They decide not to worry about it and are both glad that the adventure helped Mary Margaret feel more like herself again.

Back at the Sheriff’s station, Hook finds an upset Emma looking at a cardboard box that she describes as “what’s left of [her] childhood.” Hook asks for the honor of seeing it and she opens it for him. He finds her old glasses and a picture of her and Neal. She then pulls out the video camera that she and Lily used in the house. She shows Hook the footage of her and Lily, but then it cuts to footage that Emma has never seen before. Teenage Emma is trying to grab the camera from another kid, when a woman – the Snow Queen – walks in, scolds Emma, and turns the camera off.

Catch “Once Upon A Time” Sundays at 8/7c on ABC.

Reach Staff Reporter Alex Reed here.