Basically, Emma has been reading Henry's book a lot about her parents and has a dream that Mary Margaret and David looked like they did in the book.
Emma had awoken as usual like she did every morning. The sun streaming through her window, slightly shining on her face. She slowly opened her eyes as she blinked a bit, taking in her surroundings as she normally did. Her eyes and vision finally settled on two people she found familiar but this time was different.
Emma frowned as her vision started to become clear and her expression quickly turned to panic. There were two people in her room that looked a bit like her parents but at the same time didn't.
"Emma? Are you alright?"
"Who are you two? What have you done to Snow and David?"
Snow and David exchanged strange looks. Snow reached forward to touch Emma but, Emma quickly flinched, falling out of her bed.
"Emma, honey. It's us. You're okay."
"No. No, who are you? Are you Regina trying to get back at me fore thinking you killed Archie?"
David knelt down in front of Emma with his hands up "It's okay. We are us. I promise."
She looked over at Snow then at David who now had a knife in hand with an evil smile "NO!" she screamed before waking up in a cold sweat.
She looked around her room. It was morning and there was no sign of her parents in her room. No sign that anyone but her was in there. She took a few short but deep breaths before getting out of her bed and walking out her room. She still couldn't shake her dream.
As she descended down the stairs she still had a weird feeling. She could hear Snow laugh and David talking about something but she was still pretty out of it until she heard her father speak.
"What do you think Emma? Halloween is in a few days, do you like our costumes?"
Emma frowned as she looked up and let out a blood curdling scream at the sight that she saw and ran back up to her room, making sure to lock it right behind her.
Snow gave David a puzzling look at their daughter's reaction. "What did we do?" she asked as she removed the long, black wig from her head that looked like her own hair.
David couldn't help but laugh "Maybe it was that horrible wig of your's"