Disclaimer: I am not the owner of Phineas and Ferb or Rise of the Guardians.
A/D Doofenshmirtz was getting very confused very quickly. He could tell that his machine was meeting some kind of resistance, but he could not see what. Occasionally, he would spot some kind of ice or shadows nearby, but they vanished almost as soon as he saw them. The boys seemed to be unreachable, though, because every attack he tried to give them was blocked by this invisible force. "Come on! What's wrong with this thing?" A/D Doof asked, slamming his hand against the controls and blaming the machine.
As he did so, he heard the sound of another collision with his robot. Bunny had thrown his boomerang at it once more, grunting as he saw how little damage it did. "This thing is tougher than it looks." he commented, trying to think of another way of attacking it. Jack was shooting ice at the thing, Pitch's nightmares were biting and clawing at it, and Pitch himself was sending waves of black sand everywhere to take it down. While it seemed to keep it in place, none of their attacks were actually harming the machine.
Things were not looking good for them. After all, they would get tired eventually and slow down in their attacks. Once that happened, it would be all over. They could only hope that Pitch was right about how to stop this guy, no matter how crazy it sounded. They didn't have any other option right now. "Come on North, where are you?" Jack asked, grimacing as he sent another ice blast towards the arm to prevent it's punch towards the boys again. Sandy glanced around nervously as well, wishing he could help but knowing he was needed to keep the dark dream sand away from the children.
The next punch broke through their defense, going quickly towards the boys. "Sandy, do something!" Jack yelled, afraid of what would happen if it hit the boys. Realizing that Sandy was busy purifying dream sand, Jack decided to try something a little different. "Phineas, Ferb, start running!" Jack yelled, flying close to the ground and creating a layer of frost on it. As the boys ran, they eventually slipped on his ice and slid across the floor, flying out of the way of the fist that created a giant hole where they had been standing. Jack winced slightly as the boys collided with the wall, but at least it was better than being hit by that fist.
"Hey, Ferb, look at that! I lost a tooth!" Phineas said proudly, holding it up for his brother to see.
Tooth flew over, immediately distracted by the possibility of collecting another tooth. "Oh wow! It is beautiful, not quite as amazing as Jack's teeth, but still well-taken care of. Here you go!" she said, flipping a quarter in his direction. Phineas caught it and grinned at the fairy who held his tooth, happy to have been able to help with whatever it was she did.
"Really Tooth? We don't have time for that!" Pitch complained, seeing her messing with the boys. She turned around and flew back to the fight, remembering that she had work to do before she could admire the tooth some more.
"How did you get over there? Is that ice on the floor?" A/D Doof was asking, trying to solve the mystery of what was protecting these boys. Some mysterious force existed in this world that just wouldn't let him destroy these kids. It was the most annoying thing ever and he was going to find a way around it. As he focused on making another plan for his next attack, a portal opened behind the robot, bringing North back along with a bag of toys.
"Did you have to bring so many of them, mate?" Bunny asked, getting frustrated that they had waited this long because North wanted to bring fifty trains instead of one.
"Sorry, I couldn't pick just one! Now, let's see which one he likes." North said, dumping out a bag filled with toy trains on the floor. Seeing them appear from no where, A/D Doofenshmirtz stopped his attack and stared. Within the pile there wasa single train that looked so familiar to him, just like the one from when he was a child. The others were just as amazing, but this was the one that warmed his heart and made him step outside of his robot.
"Choo-choo?" he said hesitantly, picking up the train and trying to figure out where it came from.
"Yes, that is your stupid toy train, let's get this over with!" Pitch grumbled, frustrated with this man that took things way too far. Children lost toys everyday, it didn't mean they had to become evil as a result. For Pitch, it had taken years and years of suffering in the shadows, unseen by the world and unable to speak to anyone. A train was a stupid thing to destroy your life over, especially in Pitch's mind. This man had not suffered at all, not compared to any of the Guardians or himself who spent years being invisible to the world around them before gaining belief.
"Hey!" another voice yelled out, walking in and joining their fun. The Doofenshmirtz from this world had arrived, finally bringing his toy train for his other self. When he saw the pile of trains on the floor, including the replica of the one he had in his hand, he was angry with the others for stealing his chance to be the hero. "I went through all of that work for nothing! I brought this train, my train, for nothing! Way to ruin it guys, you just destroyed my plan!" he complained, talking to Phineas and Ferb since the Guardians were invisible to him.
"Dr. D, we didn't bring those trains here. North brought them." Phineas explained, realizing that the scientist couldn't see any of them.
"North? Who the heck is North?" Dr. Doofenshmirtz asked, glancing around the room. It didn't look like anyone else was here, but these boys seemed to see someone.
"Another choo-choo?" A/D Doof was saying, seeing the train Dr. D had in his hand.
"Yeah, this one is mine. I told you I never lost it." he commented, still focused on finding the person the boys had mentioned.
"He's more commonly known as Santa Clause, or Saint Nick, the guy who brings presents to us during Christmas." Phineas explained, making the scientist sigh. Of course, Santa was real in this kid's mind. Then again, how else could he explain the sudden appearance of tons of toy trains on the floor of his apartment?
Slowly, Dr. Doofensmirtz began to open his mind to the possibility that the kid was telling the truth. As he did so, a person appeared in the room, a giant man with a long white beard and two swords in his hands. He wore a dark red coat and he looked pretty happy to see them here. "Looks like Pitch was right. Trains did stop him!" North commented, glancing towards the other Guardians.
"Oh, wow, I guess I should have seen that one coming. If he's real, who else is here?" Doofenshmirtz asked, noticing that North was talking to someone else he couldn't see.
"Pitch Black, Sandy, Tooth, Bunny, and Jack Frost." Phineas replied, pointing at all of them as he introduced them. While Doofenshmirtz wasn't able to see them until after he believed they were there, he was shocked to see people appearing from nothing in his home.
"Do you see them too, Perry the Platypus?" he asked, glancing towards his nemesis who shrugged at the scientist. Yes, Perry could see them, but it wasn't too much of an issue in his mind. They were all helping fight evil, so it didn't concern the secret agent.
"What are you guys talking about?" A/D Doof asked, taking a break from his reunion with his toy. When no one answered, he shrugged and went back to hugging the toy train he had found on the ground. "It is you! Oh, heart melting, backstory resolving, evilness diminishing." he cooed, earning himself a glare from Pitch and an eye-roll from Perry.
Jack chuckled in the background, amused by how dramatic this guy was. "Seriously? This was all because of that stupid train?" Jack asked, glancing towards Pitch.
"As unbelievable as it sounds, yes, yes it was." he replied, watching as the evil dictator pulled out a self-destruct button to destroy the robots.
"I'm going to be right back. I've gotta get Jamie and send him home." Jack told them, flying off towards the children who were celebrating in the street. It didn't take him long to locate both Jamies, who were climbing out of the suit they had used during the battle.
"That was awesome!" Jamie said, grinning at his other self and not seeing Jack approaching.
"I know, right!" A/D Jamie said, just as excited as his other self. The two boys were grinning at each other when they both got a face-full of snow, courtesy of Jack Frost.
"Jack!" they both yelled in unison, recognizing the playful winter spirit.
"Hey kids! Good news, the robots are gone! Looks like it's time to take you home, kid." Jack said, turning to the version of Jamie still dressed in clothes from the other dimension. He nodded, glancing towards the Jamie he had met here and waving goodbye.
"Well, I guess this is goodbye then. It was great meeting you!" he yelled, earning himself a smile from this world's Jamie.
"See you later! Don't forget to have some fun with Jack Frost in your dimension too!" he yelled, watching the two of them fly away.
"I'll be back soon, Jamie! Then the real fun will begin!" he promised, waving at the kid as he flew off towards the building once more.
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