Larry Koopa psyched himself up. Mario would be coming in a few moments and, this time, Larry had a plan that couldn't possibly fail. That portly plumber would never be getting by him. Not this time.

From the minute that his dad, King Bowser, told him to get the Koopalings ready for another invasion, he was thrilled. He'd been planning for months how to best Mario and now was his time to show Bowser what he could really do. Once again, he'd set himself on the front line of the attack. It was something he'd taken to doing ever since the get-go. As leader of the Koopaling Special Task Force, he felt that it was his duty to set himself and his siblings up for success and, most times, he felt that setting himself up as the first line of defense was only necessary. Sure, there were exceptions. He'd put Iggy or Lemmy on the front lines before, but, in the end, he mostly found himself best-suited for the job.

Being in charge of the Koopaling Special Task Force was a position Larry took gladly. At the time, Ludwig was still due to be heir to the Koopa throne and, even still, he was also Bowser's top military advisor right alongside Kamek. As such, Ludwig didn't really have a lot of time to deal specifically in what the Koopalings were going to do, so that was a position that was offered to Larry, as he was counted as level-headed enough to take the job. It was a position that Larry had readily accepted and was still proud of to this day.

Just then, Larry heard footsteps. He tightened his grip on his wand and took up a battle stance. This was his time to shine. His opponent then skidded into the room, the telltale sign of his identity being his green cap.

"Ugh. It's just Luigi..."

"Hey!" Luigi cried. Luigi, Mario's younger brother, had always been considered as a much less significant threat to the Koopa clan than his older brother. Mario was practically a war machine, taking down army after army with just his bare hands and maybe a power-up or two. Luigi, though, was clumsy and timid. Sure, Luigi could jump higher than Mario, but jumping a foot higher can only get you so far. Still, though, Luigi was still at least somewhat of a threat. He'd need to be taken down as well.

"I was expecting Mario, but you'll do for now," Larry groaned.

Larry then lunged toward Luigi, his wand cloaked in flame. Luigi leaped aside, using the power of a fire flower to engulf his own hands in green flame. It was a fire-versus-fire battle that Larry was determined not to lose. Larry then shot multiple fireballs at Luigi, which were quickly dodged. Luigi then swiftly came down onto Larry's head. Larry dropped to the ground and retreated inside of his shell. His head was pounding and he needed a minute to recover. Luigi tried bombarding Larry with fireballs, but Larry's shell was completely fireproof. Despite this, though, Larry was beginning to heat up. Propelling himself forward with a quick spin, Larry lunged toward Luigi once more, this time from the safety of his own spiked shell, but this was dodged as well. Feeling up to it, he then decided to show himself once again. He wondered exactly how long it would take until he could land a hit on Luigi, or how long he could even last if the battle kept going how it was.

A lone Magikoopa was perched somewhere above the battlefield. His job was simple. He was supposed to fly out over the battlefield before the fight started and give his assigned Koopaling a special magical power-up. This Magikoopa, though, was distracted. He didn't even know the fight had begun. He was completely preoccupied with the book he was reading. A sudden fireball scorching the wall just near him, though, snapped him back into reality. He cursed himself for getting so distracted and hastily grabbed his broom and flew out over the battlefield. He recited a random spell, whichever one came to his head first. He didn't care which one it was. After all, what was the worst that could happen?

The fire was flying all across the battlefield at this point. Just then, Larry scored a hit on Luigi, knocking him backward into a wall. Luigi's firepower was now gone. Larry couldn't help but crack a grin. Things were finally going right for him. Just then, he noticed something above him. He looked up and saw a Magikoopa soaring in the air just above him.

"Took him long enough," Larry scoffed. As the magic dust began to fall, he waited to feel the power it would give him, but it never happened. In fact nothing happened at all. The Magikoopa then flew away, supposedly content with his work.

"Hey!" Larry yelled, "Come back! Nothing happened!"

Just then, a shiver traveled up Larry's spine. Was it happening now?

Luigi watched Larry call out to the Magikoopa that had just flown past. He then got up and prepared himself for Larry's next attack, but, instead, Larry froze, overtaken for a second by a quick shudder. Luigi took a step backwards, but he then began to feel lightheaded. He let himself slump back against the wall behind him. Larry turned around and began toward Luigi, but, hallway across the room, Larry suddenly collapsed. Luigi stared in horror at the Koopaling, now lying motionless on the floor. Luigi's vision then began to blur before he too fell into unconsciousness.

Mario quickly leaped out of the way of a Thwomp that had come crashing down a little earlier than expected. He'd been lucky to escape that one. He now found himself just outside the door that would lead him to the Koopaling he'd have to defeat to reclaim this castle. He'd left the first castle to Luigi so that, together, the two of them could reclaim the Mushroom Kingdom territories faster.

As Mario swung open the large doors in front of him, he began mentally preparing himself for the fight ahead. He knew he would be fighting Morton this time, so he went over the list in his head of tricks he knew Morton might pull out. It was never easy for Mario to fight the Koopalings, not just because they were hard to defeat, but also because Mario knew they were all still young. He knew that Morton was still only twelve years old, though he looked older than he was. He he had to set his inhibitions aside, though, for the sake of the Mushroom Kingdom. The Koopalings were some of Bowser's greatest fighters. They had to be defeated if peace was to be returned to the Mushroom Kingdom.

Just then, though, Morton ran by right past Mario. Mario, bewildered, quickly rushed after him.

"What's going on?!" Mario called out.

"Larry's in trouble! Something happened!"

Mario gasped in surprise. Larry was in Grassland right now, which was exactly where Luigi was as well. If Larry was in this much trouble to where Morton would leave his post to go find him, then there was a good chance that Luigi was in trouble as well.

Mario burst into the final chamber of the Grassland castle. He found that Morton had already arrived. He was now standing over an unconscious Larry. On the other side of the room, Luigi also lay unconscious. Mario immediately rushed over to his brother, cradling him in his arms.

"Hey," Morton called to Mario. Mario turned to face Morton, who had heaved Larry up over his shoulder.

"What?" Mario asked.

"Just take my castle," Morton said reluctantly, "I surrender."

Before Mario could even register what had just happened, Morton ran off. Mario then decided that it would be best to get Luigi home before he continued on his journey.

Larry's eyes fluttered open. He stared at the ceiling above him for a moment, trying to register what had just happened. He then took a moment to think about the ceiling. It was a stark white, unlike any of the ceilings back at Bowser Castle or even at the castle he was just in. He shot up in an instant, frantically looking around. The "room" he was in had two beds, one decorated with a red bedspread and the other, the one he was in, with a green one. The room itself was actually more like a loft with the rest of the house laid out below in an open-concept fashion. Just then, he caught a glimpse of a portrait on the wall. It was the Mario Brothers, Mario's arm draped over Luigi's shoulder and the two of them grinning.

"A-am I...inside the Mario Brothers' house?!"

Larry reeled back. Why was he here? He lifted his hand to wipe the sweat from his brow, but quickly jerked it backward again, gaping in horror at it. His hand was covered by a thick, white glove. Yanking the glove off of his hand, he quickly found that it wasn't even his own hand, but it was, instead, that of a human. Panicking, Larry made for the bathroom to check his reflection in the mirror. What he saw, though, startled him even more than anything else had that day.

"I-I'm Luigi?!"

It was true. His head was adorned with the iconic green cap and his face was adorned with the iconic mustache. There was no mistaking it. Somehow, he'd switched bodies with Luigi.

"Wait a minute! If I'm Luigi...that means that Luigi is me!"