Oh wow, I never thought I'd do a crossover but I have to say I am so excited right now. I've seen so much art work and fan made videos and stories of the Big Four and I just couldn't help but get in on it. So I wrote a story.

I am mostly in the Ironman and Grimm section, but just recently did a ROTG fanfic and loved it so much I had to do more with Jack Frost.

Keep in mind, I have not really read many stories with the Big Four, just excerpts. I do this so I can think of my own story lines and keep it as original as possible. But what I have read and seen I adore.

With that in mind, this is completely from my own head. I really hope it goes well.

Please, please, please review and let me know what you think. I have been improving my writing for the past two years and it has helped me grow as a writer, so I really would love feedback.

Enough rambling, I hope you enjoy the first chapter!

Part of Your World:

Prologue

Jack Frost had had a fun-filled day causing chaos in the kingdom and now he retreated into the woods. He was busy making it snowy and chilly when he heard something. As he whizzed by the frosted trees he was creating, he decided to ignore it. He was laughing and enjoying himself when he heard it again. It was an odd sound for the forest to make. He knew no one really lived around here, so he finally looked up and tried tracing the source of the sound. After listening for a while he determined that it was definitely a kid crying. It was small and very sad. He wondered if it was a lost child.

He flew around and finally soared over the trees and found a very small tower. It looked very odd in the middle of this random plain, surrounded by trees. No human could exactly get to it and he wondered if that was the owner's intent.

He finally flew to the base of it, hoping to find a door of some kind. He did, but it was definitely locked.

He walked around and noticed a window at the top of the tower. He flew up and peeked inside the dark tower.

He saw a fire going and opened the window a little more. He heard the sobbing sound much closer now and he knew he'd found the source of the noise at last. He looked around the dark room and nearly jumped when he saw a tiny little girl with the longest blonde hair he'd ever seen crying in the corner.

She looked to be only five years old.

"Hey…" he said, softly, hoping to get her attention. He knew that not many could see him, but he always tried.

The girl gasped and stared at him in shock, backing further into the corner.

"MOTHER!" she cried, sobbing.

"It's okay." He said gently, putting his hand up, "It's gonna be okay, I won't hurt you, I promise." He told her. He was relieved she could see him, but he didn't want to scare her.

She sniffled and wiped her eyes, looking hopelessly around. She clutched her long hair and Jack had to wonder why on earth she felt the need to protect her freaking hair when she finally cocked her head to the side.

She was a very darling little thing, with rosy cheeks and big bright green eyes. He smiled at her and knelt before her, "Where's your mother?" he asked her.

She sniffled and cried, "I don't know!"

"Okay, it's okay." He said again, "I'm sure she's around here somewhere."

The little girl wiped her nose and Jack finally sat on his knees in front of her, "What's your name?" he asked.

"Rapunzel." She mumbled nervously, still holding her hair, "You look funny."

He laughed, "Yeah, that's because I'm kind of a spirit." He admitted.

"A what?" she asked in the cutest little voice he'd ever heard.

"I can actually make snow and wind and ice." He told her.

"You can?" she asked, her mouth gaping.

"Yeah." He nodded, "Here, watch."

He put his staff on the floor and Rapunzel leaned forward and giggled as icy frost covered the floor. She touched it and breathed, "Wow."

"I'm Jack Frost, Rapunzel. It's nice to meet you." He smiled at her. She smiled back and he could tell she was feeling a little better, "Tell you what, I'll wait here with you until your mother comes back." He suggested.

She nodded happily and took his hand, noticing how cold it was.

"What if Mother doesn't come back?" she asked as he led her towards the fire, trying to keep her from slipping on his ice.

"I'm sure she will." He told her, "But just in case, I'll go and find her later, does that sound okay?"

She nodded again and sat down by the fire. He tried to avoid it and he watched as she found a brush and started brushing her long hair. He chuckled and picked up some of it, "You have very long hair." He commented.

She nodded, "It's special hair."

"Really?" he asked, relaxing nearby.

"Yeah, my mother says it has special powers and that's why I have to stay hidden."

Jack narrowed his eyes, "You mean you never leave this tower?" he asked.

She shook her head, "I can't go outside."

"Why?" Jack asked, astounded that this poor girl had never set foot outside to enjoy snow or grass.

"Cause bad people will try to cut my hair and hurt me." She said seriously.

"Gosh." Jack mumbled, "I didn't think people could be that cruel." This poor kid was only a child, how could anyone do that to her.

"Do people know about your hair?" he asked her.

She shook her head, "Only Mother, but she told me not to tell."

Jack nodded, "Well, I won't steal your hair, I promise." He said, laughing, "I mean, what would I do with it?"

She giggled as he picked some up and pretended to wear it as a wig and then a beard, "Not my color." He chuckled.

"You're funny." She grinned.

"Thanks!" he said, taking that as a compliment.

She looked towards the window forlornly. He had a feeling she was waiting for her mother.

"Where did she go?" he asked her.

She shook her head, "I don't know, I woke up and she was gone."

Jack sighed and wasn't sure what to do until he had an idea, "You wanna have a little fun while we wait?" he asked.

"What will we do? Paint?" she asked excitedly.

He chuckled, "Nah, I have a better idea."

He quickly iced the floor making it slippery. He decided that since this poor girl had never been outside, he'd bring the fun to her.

"We're gonna skate." He told her.

"What's that?" she asked.

He put his staff down and took her hands, bringing her onto the icy floor. She giggled when she slipped, "Whoa!"

He laughed, "Hold on!"

He spun her carefully watching her giggle and slide.

He laughed with her and when he felt she was pretty tired he finally stopped.

"That was fun!" she said happily.

He smiled; proud he could help her out.

She finally yawned and he figured she needed to sleep, "You should go to bed. I'm sure your mother will come back while you sleep." He told her.

She frowned, "Are you going to leave me?"

He smiled, "No, I won't leave you, I promise."

She smiled and rubbed her eyes while he led her to her bed.

She grinned as he tucked her in and she reached up to touch his hair, he bent down and smiled as she ruffled it, "It's cold." She remarked.

"Yeah, that's cause I'm a winter spirit." He told her.

"Do you have a family?" she asked him.

"No." he said sadly.

"How did you get here?" she asked sleepily.

He looked up and described the darkness as the first thing he remembered. Then he told her about the moon and how it spoke to him. He described the feeling of cold and happiness he felt when he first frosted the earth. But then he described how lonely he felt that no one could see him. He sighed, wishing he knew why he was put on this earth.

He looked over and smiled as Rapunzel finally fell asleep. He kissed her forehead and promised to stay with her that night.

The fire died and he had to wonder where her mother could be.

….

Jack had waited all night but didn't hear or see anything. He even left the tower very briefly to look in the woods, but didn't see anyone.

He came back, relieved Rapunzel was still asleep, but worried as well.

By the time she did wake up, she was glad to see him, but also just as worried.

"Oh no!" she cried, "The bad men took her!"

"Who are the bad men?" Jack asked.

"Ruffians." She said, "Mother said that there are lots of them out there."

Jack had to roll his eyes. Her mother sounded like a worry wart, "I'm sure she's just a little lost or something. She'll come back." He told her.

She went to the cupboard to find some food and Jack noticed there was hardly any there. That might be why she left.

While she nibbled on some bread, Jack looked out the window and still saw no sign of anyone.

"How about you tell me what she looks like and I'll go look." Jack suggested.

Rapunzel looked worried, "What if you get lost and don't come back." She cried, "I'll be all alone!"

He smiled, "I can fly, so no worries." He told her calmly.

She looked down sadly but then looked out the window. He knew she just wanted her mother to come back. She finally nodded and looked at him.

He listened as she described her mother to be older, with black curly hair, wearing a red dress and a black cloak. He nodded and promised to be back as soon as he could.

"Here." He told her, getting out her paintings, "You paint me an awesome picture while you wait."

She smiled, coming over, "I'll paint you." She told him.

"Make me look good!" he smiled as he flew away.

He saw her wave to him as he disappeared. He frowned, wondering what could have happened to her mother, hoping she wasn't hurt.

…

He looked all over, looking for anyone who resembled Rapunzel's mother. He looked all over the forest and in the kingdom. He even visited another kingdom briefly to see if anyone there looked like her. By the time he got back to Rapunzel's tower, her mother still hadn't returned.

He went in sadly and saw Rapunzel finishing a painting on the wall. He smiled and saw it was a painting of him and her ice skating in the room.

She saw him and smiled brightly, getting up, nearly tripping on her hair, "You came back!" she squealed happily. She ran right to him and hugged him. He smiled and bent down, "Course I did."

"Did you see my mother?" she asked.

He frowned and shook his head.

Rapunzel looked sadly out the window, "Is she gone?" she asked sadly, going to the window.

Jack sighed but clung to hope, "Maybe she just went a little further than usual is all." He suggested, coming over and leaning on the window frame.

Rapunzel sniffed and sneezed.

"Bless you." Jack laughed.

She looked tired and he wondered if she was getting sick. He sure hoped not because chances are he was the reason she was sick.

He closed the window and helped Rapunzel start another fire. He decided she should lay down while he waited for her mother.

She fell right asleep and he smiled as she slept. He looked around at all her paintings, lit up by the glowing fire. He found a painting of flowers and suns, even intricate designs she'd created all on her own. He found the one of him and her and he smiled, rubbing his hand on it.

He looked sadly towards Rapunzel sleeping and wondered if she would be alright.

He sighed and sat by her bed all night, waiting.

…

By morning Rapunzel was very sick. Not only that, she was running extremely low on food. Jack tried finding something for her outside but he was no cook and she needed soup for her cold.

She was looking sweaty and tired and she had trouble sleeping. Her cough was getting worse and he was starting to wonder if maybe something hadn't happened to her mother after all.

He paced, hoping for some sign of help. He wanted desperately to hold her or make her laugh, but he was the reason she was sick. She needed to keep warm and he was of no benefit, but there was no one else who could help her.

He felt very stuck and afraid. He was wondering what on earth he could do when the windows shot open and the moon shone through. He went to it and could have sworn he heard the Man in the Moon talking to him.

"Do what?" he asked, not sure he heard correctly.

He sighed, running a hand through his hair and looked at Rapunzel fitfully sleeping.

It had been nearly four days since she'd seen her mother. And he knew she wasn't allowed outside, but she was sick and he was the only one who could do something.

He looked up at the moon and got all the encouragement he needed.

He nodded and finally made his decision.

He went to Rapunzel and covered her in blankets, picking her up carefully.

She moaned painfully and coughed.

"I know." He whispered, "All I can do is keep you cold."

He carried her to the window and held her close, looking at her sweet face. He finally reached the window and looked once more at the dark tower. The fire had gone out, it was completely empty, and he knew that if Rapunzel stayed here any longer, she could die.

Looking once more to the moon, he asked the wind to take him where they needed to go.

…..

Merida laughed as she played hide and go seek with her mother. She squealed as her mother caught her and tickled her tummy.

Her father finally came over and gave her her new birthday present; a brand new bow.

He was instructing her on how to shoot and she ended up overshooting it.

"Go and get it!" he told her laughing.

She giggled and ran off into the woods, looking for it.

She suddenly heard a strange noise and looked around and gasped.

"A wisp!" she breathed, following them. She laughed, hoping to catch one when she gasped.

There was a boy with white hair and blue eyes, holding something in a blanket. She stared at him in wonder. He looked up at her and held up a hand, "It's okay!" he told her, "I won't hurt you."

"Who are you?" she asked him, coming closer and feeling brave.

"My name is Jack Frost." He told her, "And this is my friend, Rapunzel. She's very sick. Can you help me?"

Merida looked down at the little blonde girl in the blankets who was her own age. She had her eyes closed and was coughing.

"What's wrong with her?" Merida asked the boy sadly.

He frowned, looking defeated, "She's sick, very sick. I can't help her."

Merida nodded and came closer.

"Do you have a mother and a father?" he asked her.

She nodded.

"Can you get them?" he asked, putting Rapunzel down.

She nodded and turned, "I'm Merida, by the way."

He smiled at her, "Merida, do one more thing before you leave."

She nodded and turned to him.

He looked sadly at Rapunzel, "Tell Rapunzel that I'll never forget her."

Merida chuckled, "I'll let you tell her that."

Then she turned and ran off to find her parents.

Jack put Rapunzel down and kissed her forehead one last time, "You're safe now. I have to leave." He said sadly, "I'll never forget you."

He heard people rushing over and took off flying.

Merida came rushing back, pulling her parents with her and jabbering about a boy with a sick girl.

"Over here!" she cried and pointed to the blankets on the ground.

"Oh heavens!" Merida's mother cried, going to Rapunzel.

"She's sick!" Merida told her.

She suddenly looked around, "Where did he go?"

"Where did who go, love?" her father asked, going towards his wife and looking at the little girl.

"The boy with white hair." She explained, "He was holding her and he asked me to find you."

"There is no boy, little one." Her father said.

"She needs a doctor fast." Merida's mother said, picking up Rapunzel and cradling her, "Poor wee thing."

"Let's get back to the castle." Merida's father suggested.

As they left, Merida looked around but could not see the boy. She was certain he was really there. She sighed and followed her family.

They got back to the camp and one of her father's men brought a horse over. Merida was handed to her mother who was also holding the very sick girl.

"I wonder who she is." Her mother commented.

"The boy said her name was Rapunzel." Merida said.

"What a strange name." her mother smiled, "But very beautiful. Look at those locks, just as strong as yours."

Merida nodded and looked over, screaming.

A giant black bear was in the camp site, ready to attack.

"Get out of here!" her father yelled, weapons ready.

Merida held on as her mother rode off with the girls.

The last thing she remembered seeing was her father attacking the bear and a sudden gust of wind shooting through the air.