Disclaimer: I do not own Rise of the Guardians or Phineas and Ferb.

No changes have been made, this has been updated to give everyone an announcement! I have written a sequel to this story, titled Easter Sunday. If anyone is interested, feel free to check it out after finishing this story, I feel like it has shown that I've improved quite a bit since writing Winter Break.

"Alright, time to have some real fun now!" Jack announced, grinning at all of them and knowing that he had to get them over to the strange building first. "Who wants to go sledding?" he asked, knowing he had all of their attention now. "Come on guys, how much more entertaining can this day get?" Phineas asked, running into the garage to grab the sleds for everyone. They were all ready, sitting on the sleds and preparing for the ride of their lives. "Oh man, this is really happening! If only the others were here, then this would be perfect!" Irving was saying, crouching on his orange sled and waiting for the fun to start.

"Alright, this is going to be a simple and fair race. First one to the strange pharmacist's house wins!" Jack announced, making paths of ice for all the children before using the wind to push them forward. "Still think this is lame, Buford?" Isabella taunted, watching the bully laugh as they raced through the streets. He stopped laughing, only to glare at Isabella. "Just shut up and eat my dust!" he yelled, pushing against the ground to propel himself forward. He sped passed her, catching up to Ferb who had been in the lead. Jack was flying alongside all of them, creating twists and turns in the ice for the children to follow. They were almost there, to the place where the scientist was waiting.

"We're almost to the finish line, kids! Hold on tight because this is where the real fun begins!" Jack yelled out, racing ahead of the others to create a massive ramp. He had to get them to fly high enough to land on the balcony above. These kids would then be able to bring the fun into that apartment for him. All it would take is a little bit of snow inside and they would all be laughing with the grumpy adult.

Meanwhile, within Dr Doofenschmirtz's apartment, Perry was getting annoyed of waiting for him to finish complaining. He was trying to be polite, letting the scientist go on and on about his childhood, but it was getting boring at this point. This trap was easy to escape, and Perry knew it from the moment he was trapped within it. Logs rolled so easily and moving just one would cause the entire structure to collapse around him. "If you're going to stop me, now's the time. I'm really going to start my machine now, any minute…just a few more seconds." Dr. Doofenschmirtz was saying, dragging it out as long as possible. Perry was really taking his time with his escape. The evil scientist was a little worried, hesitant to start his machine without the normal battle between himself and his nemesis.

Just as his hand was about to press the red start button, the entire log cage collapsed and revealed Perry the Platypus, standing ready to fight. "How did you escape my trap? That is impossible!" he yelled, grabbing his head and realizing that the fight would begin now. Perry rushed forward, kicking the scientist and sending him sprawling across the floor away from his inator. Just as Perry was about to move in and press the always present self-destruct button, he heard the sound of laughter coming from the balcony that Doofenschmirtz was now collapsed on.

Perry recognized the kid in the sled, the one that was flying through the sky and about to land on top of the evil scientist. Quickly, Perry removed his hat and returned to pet mode, afraid of blowing his cover in front of his family. Invisible to Perry and Doofenschmirtz, Jack Frost guided the sled towards the balcony, avoiding landing on the unconscious man. "How did that happen? And wait, where did his hat go?" Jack asked, his gaze moving from the pharmacist towards the platypus. It was strange, but he let it go as he discovered that the other children needed his help too.

Doofenshchmirtz began to sit up, rubbing his head and looking for his nemesis once more. He was not going to let Perry thwart his scheme again, but he couldn't find his nemesis anywhere! All he could see were some strange kids and a regular platypus, standing in his living room. "Where did he go? Hey kids, have you seen my nemesis? He's about this tall, wears a fedora, and looks almost exactly like that platypus over there." he asked, glancing at the kids. Jack stared at the man for a moment, waiting for him to take back his question. When Jack realized that he was serious, he could not hold in his laughter any longer. He fell back on the ground, holding his stomach as he realized just how stupid this adult was.

"That's all it takes to make you not see him? He doesn't have a hat so he's just a regular platypus now? That is too great, I just…" Jack was saying, gasping for air as he recovered from his laughing fit. "Do you guys know what's wrong with him?" Buford asked, a bit stunned over the winter spirit's reaction. The other's agreed with him, shaking their heads as they stared at Jack. "Perhaps we will never know the truth. Some things are beyond our understanding." Ferb announced, making them all shrug and agree to just go with it.

"Hey, there's Perry!" Phineas called out, seeing his pet in the living room here. "How'd your pet platypus get all the way over here?" Isabella asked, following Phineas inside. "Well, come on in I guess. You already interrupted my nemesis confrontation, so you might as well join for the portion of the game where my inator is usually destroyed." Doofenschmirtz said, getting frustrated with the kid's that had no sense of respect. This was his home and they were just barging in here like it was nothing.

Jack had finished with his laughter and was now ready for the real fun to begin. "Okay, I'm good now. Who's ready for a real snowball fight?" Jack asked, grinning and spreading his arms wide in the air. The kid's looked back at him, frowning. "How, there's no snow in here?" Phineas asked, glancing around the room. Buford laughed at the winter spirit, feeling like he had won his argument. The stupid kid didn't even realize that snow was necessary for a snowball fight! He was so going to prove how lame they were, to the Guardian of Fun himself.

Jack grinned at them, letting his magic surge through him and into the room he was standing in. Before long, snow began to fall quickly, building up on the ground. "What is this? Snow, in my house? No, I will destroy the snow! No one gets to have fun in it, not while I'm here." Dr. Doofenschmirtz yelled, rushing over to his inator. Jack blasted him back with a bit of cold wind, not ready to let him give up on winter just yet.

Phineas was laughing, though, already realizing that this was the perfect place to start the snowball fight that they would remember for the rest of their childhood. "Come on guy's, let's have some fun!" he yelled, throwing the first snowball. Isabella giggled, watching as the snow hit Jack Frost himself before she joined in as well. Her snowball was aimed for Buford, in an attempt to get revenge for his earlier comment about how only girl's could believe in magic. "No, how dare you have a snowball fight in my house!" Doofenschmirtz yelled, before he himself was hit with a blast of cold snow.

This time, Jack had added in a bit of his fun-inspiring magic. This guy needed it, if he was going to have fun like the rest of them. "Ha ha! He got hit in the face, did you see that?" Buford said, amused at that fact. The other's stared at him, before grinning wildly and realizing that he was having fun with a snowball fight. "Yes, I win! I told you snowball fights weren't lame!" Jack cheered, making Buford roll his eyes. "Whatever, wimp. You still aren't better than me." he announced proudly, throwing a snowball at Jack. Jack laughed and flew into the air, dodging the throw.

Doofenschmirtz was feeling strange, light and joyful instead of upset like normal. These kids were here, having fun, but this time he wasn't restricted by his father. He didn't have to stay still and be a lawn gnome. He could join in and have fun, for the first time in his life! "My first snowball fight! If only Perry the Platypus were here to see it." he said with joy, grinning as he made a snowball and threw it at one of the kids.

They were strangers to him, but it did not stop the battle from being fun. All of them were laughing, snow flying everywhere in the apartment. Jack was grinning wildly, knowing he had made the right decision to stop in this town. This was the second best snowball fight of the season, since Jack always saved his very best work for Jaimie Bennet. Even so, it was pretty amazing to be a part of. From another room in the house, a giant robot emerged with a plate of muffins, amusing Jack even further. "Muffin time, sir!" It announced, only to be pelted with snow from everyone inside. "Oh, shut it Norm!" Doofenschmirtz yelled, not ready to stop quite yet.

Norm dropped his muffins, waiting a moment before realizing what was going on. "Snowball fights are fun!" he announced, making a snowball himself and joining in. The kids didn't even question the presence of a giant robot, letting him join in the fun as well. Pretty soon, all of them were exhausted and slowing down in the battle. Phineas and Ferb had created a massive snow fort to protect themselves, while Buford and Baljeet were teamed up on the other side of the room. They had a fort as well, but for most of the shots, Buford used Baljeet as a human shield. It was amusing for the bully, even if it made Baljeet slightly uncomfortable.

Isabella was teamed up with Jack, which suited her just fine. The winter spirit was the best ally for the game, with his winter magic to help. Irving had vanished sometime during the battle, hiding behind the couch to merely observe the fun for himself. Norm and Doofenschmirtz were grouped together as well, using the snow-away-inator as a shield from all the snow. When that proved to be insufficient, Doofenschmirtz would hide behind Norm's metal body, knowing that the snow would have little to no effect on the robot.

As the fight grew more complex, the children eventually called it a draw and collapsed on the ground, ready to go home for the day. "That was awesome! I can't wait to see what you're doing tomorrow." Isabella said, grinning at her friends. Jack grinned with her, glad to see that they all had fun. One last snowball was thrown, but no one could see who threw it. Perry had finally found his chance to finish his job, with none of them knowing the truth. One last snowball was all it took to hit that self-destruct button, causing a massive explosion on the balcony right next to where Norm and Dr. Doofenschmirtz were resting. They both blinked as the explosion cleared away, now covered in black soot from the blast.

"Curse you Perry the Platypus!" he yelled, before realizing that his nemesis wasn't even here. "Oh right, you left. Hmm, I guess I don't have anyone to curse." he said afterwords, feeling like something was missing. Without someone to blame, it just wasn't the same. Sighing, Doofenschmirtz decided it wasn't a huge loss anyway. He had gotten what he wanted, a chance to have some fun in the snow with other children. As this realization settled in, Jack smiled and flew off, waving goodbye to the children. He might come back another time, but for now his work was done. The Guardian of Fun had left his mark on the tri-state area and the children were all heading home. It was a day well spent for everyone, a day that would never be forgotten by any of the children who had been making the most of their winter break by playing with the winter spirit, Jack Frost.

Thank you to everyone who has read this story! This was my final chapter to this short crossover. I hope you enjoyed! Please review and tell me what you thought of this story!