A/N. Anyways a crossover of Regular Show and Mario. I just thought of it and I thought it was a good idea. Anyways the game that will be in this fanfic will be New Super Mario Bros U. Also I don't own Regular Show or Mario. Mario belongs to Nintendo and Regular show belongs to J.G. Quintel. Anyways hope you enjoy. Also I apologize if you hate the title. It was all I could come up with. It's also my first attempt at a Regular show fanfic so apologies if I don't portray the characters right. Also for some reason when I'm in doc manager making a story, the line that separates the author's notes and story doesn't appear Anyways just read.

It was another normal day in the park. Our two main characters, Mordecai and Rigby were busy playing a video game in the house. That video game, happened to be New Super Mario Bros U.

"AGGH! This game is so hard." Rigby complained, as his character kept dying.

"Rigby, don't complain. It's a game. It's supposed to be challenging." Mordecai said, still focused on the television.

"Dude, this game is harder than most games I played. Seriously, that stupid lava at the bottom keeps killing me." Rigby said angrily.

The two were in a castle and finally made it to the end, jumped into the cannon, and went to the enemy airship.

"Alright Rigby, we work together to defeat this guy." Mordecai said.

Unfortunately for Rigby, he managed to lose his last life and that was the last straw. "OH MY GOSH! THAT TEARS IT!" Rigby shouted, grabbing the console and beginning to smash it.

"RIGBY STOP! DO YOU KNOW HOW MUCH THIS COST!?" Mordecai shouted to his friend, who was still hitting the console.

"I DON'T CARE! THIS GAME NEEDS TO GO!" Rigby shouted back, tearing off a piece of the console. Unfortunately for the two, the game started to hiss and smoke, then bright blue electricity started to shoot out.

"DUDE WHAT DID YOU DO?!" Mordecai shouted to Rigby

"I DON'T KNOW! RUN!" Rigby shouted.

The two then started to run. It appeared that the game was sucking them close to it like a vacuum. Then, the two were sucked inside the game, a bright flash of blue electricity covered the room leaving no trace of the game.

The two had been sucked inside the Mario game and were falling from the sky heading right into the castle.

"I JUST HOPE WE DON'T LAND HARD!" Mordecai shouted. The two then fell right through the ceiling and landed inside the dining room.

"I think I have some brain damage." Rigby said, rubbing his head which hurt.

"Excuse me, but who are you two?" A voice asked from the end of the table. The two looked up and it was none other than Princess Peach.

"Dude, it's the princess." Rigby said. "We're in the Mushroom Kingdom."

"OHHHHHHHHHHHHHHHH!" They both shouted at the same time

"Seriously, who are you two?" The princess asked, getting a little angry

"Well I'm Mordecai and this is Rigby." Mordecai said.

"Nice to meet you two. Do you know where Mario and Luigi are? I invited them for tea this morning." Peach said

"No idea. But we'll have some tea with you." Rigby said

"Rigby I don't even like tea." Mordecai said to Rigby

"Dude, do you want to hurt the feelings of royalty? Just say this is a good idea." Rigby said.

"Fine. But this better be quick." Mordecai said, angrily.

At that moment, a bunch of airships with faces of koopas carved on the front were busy flying to the castle. The biggest one had an ugly looking koopa face. That big airship was driven by none other than King Koopa, AKA Bowser.

"Ha ha, tonight Princess Peach will be mine. But this time, I beefed up my forces and hired more muscle so that this time, Mario and Luigi won't be able to rescue her. Heh heh heh. Also, someone bring me a glass of water." Bowser said.

"Then, Benson got so mad his gumballs nearly jumped out of his head." Mordecai said. He was telling a story of one of their adventures in the park. The three laughed at this story.

"You two sure do come from an amazing land. Here, the only entertainment now a days is watching Mario and Luigi jump on koopas. Oh and also television." Peach said.

"Yeah, well you should hear about Muscle Man's 'My Mom' jokes. Be glad you won't." Rigby said.

Meanwhile, the airships had started to get close to the castle containing the three.

"Alright, wait for my signal and when I do give the signal, fire the cannons at the castle but not too much. We don't want to kill the princess." Bowser said.

The three were busy drinking tea and telling stories. It was a good time.

"What a great day, I hope nothing bad happens." Mordecai said. At that moment, the gang heard rumbles from the top of the castle. Then, they saw parts of the castle fall from the ceiling.

"I just had to open my big mouth." Mordecai said.

Then, a giant metallic hand came from a hole in the ceiling.

"WHAT'S GOING ON?!" Rigby shouted, starting to panic.

"IT'S ANOTHER BOWSER ATTACK! MORDECAI, RIGBY, PROTECT ME!" The princess shouted. The giant metallic hand then grabbed the princesses' chair and scooted it away from Mordecai and Rigby. Then, to their horror, the hand smashed into the raccoon and blue jay sending them flying. Finally, it grabbed the two and lifted them out of the castle right to Bowser's face.

"Well well if it isn't Mario and Lui-wait who are you?" Bowser asked, perplexed at the two.

"The question is, who the heck are you?" Mordecai asked

"I am King Bowser, king of the koopas. I've never seen people like you before around these parts. Now tell me who you are before I have my minions make this hand throw you far away." Bowser said.

"Well I'm Mordecai and this is Rigby." Mordecai said.

"Why don't I ever get to introduce us?" Rigby asked.

"Remember that time when you introduced me to that friend of yours? Mordecai asked

"Oh yeah I remember. Sorry about that." Rigby said.

"Anyways King Bowser, we're not going to let you kidnap the princess." Mordecai said.

"Oh I think you will let me kidnap the princess, because you won't be around." Bowser said.

The hand then started to squeeze Mordecai and Rigby until they nearly ran out of breath. "Strike one." Bowser said.

The hand smashed them onto the airship repeatedly until the two were pretty much injured badly. "Strike two." Bowser said

Finally, the hand started to swing around with the two inside then threw them far away into the forest of the Mushroom Kingdom. "Strike three, you're out." Bowser said with an evil smile.

"AHHH RIGBY WHERE ARE WE GOING?!" Mordecai shouted to Rigby, both of them still flying far away

"I DON'T KNOW, BUT IT LOOKS LIKE WE'RE GONNA CRASH INTO THAT TREE!" Rigby shouted.

The two ended up crashing into a tree that looked like it had acorns, only these had black pupils on the front like they had eyes. The "acorns" were sent out of the tree and flew off. The two then fell out of the tree onto the ground with a thud.

"I think I just broke my nose." Mordecai said, getting up.

"Seriously what is this place?" Rigby asked, looking around until he saw a sign.

"This signs says... Acorn Plains." Rigby said, reading the sign.

"Oh great so we're in a field of nothing but stupid acorns." Mordecai said, slapping his face in frustration. "How can this day get any worse?"

"I don't know. Let's just see if we can find our way out of here." Rigby said. The two then walked down the path leading to Acorn plains unaware of the adventure they would have.

A/N. I hope you enjoyed this story. I thought it was a good idea. Anyways next chapter coming soon. Not much else to say except favorite or leave a review if you like. Until next time. Also, you're probably wondering what happened to Mario and Luigi. Next chapter will show what happened to them and where they are. Like usual, until next time