Mario: Bowser you coward, why don't you come to fight me instead of running away?
Bowser (on one of his airships with Peach as a hostage): HAHAHAHAHAHAHA Dream on Mario, if you want to see your princess again come to my castle, that's where I will finally crush you and after that Peach will be mine and the Mushroom Kingdom too.
Mario: Don't count on that shell brain, I'll get you.
Luigi: We're going with you brother.
Yoshi: Yeah, we are a team.
Mario: All right, let's go.
They go through many challenges to reach Bowser's castle.
Mario: It's very different from what I remembered.
Bowser (appearing on a big screen): Did you like it? I call it Neo Bowser's Castle 2.0 I'm in my throne room waiting for you... if you can make it there, spoiler alert you won't.
Mario: We'll just see about that. (he punches the door and breaks it so the three enter)
Luigi: I think they were already waiting for us. (he says when he sees a bunch of those enemies you already know)
Yoshi: Good, I was really hungry.
They start to destroy members of Bowser's army, but the more they defeat the more enemies appear.
Mario: We're not going to get anywhere like this.
Luigi: Hey look up there. (he points to a pipe from which Bowser's minions are coming out)
Mario: I have a plan, but we have to surround them.
Luigi: So I think it's time to...
Mario and Luigi: CYCLONE BROS.
Yoshi uses his tongue and swallows all of Bowser's minions at once, turning them into a giant egg.
Luigi: Do it Yoshi!
Yoshi throws the egg into the pipe which blocks the pipe and stops Bowser's minions from spawning.
Mario: All right, to the next area.
Arriving in the next area:
Luigi: What is this? it looks like a computer.
Yoshi: Here it says: 'To open the door enter the code, see the image next to it for more details'
They look to the side and see some images.
Mario: (watching the images) Lava Bubble, Lava Bubble, Twhomp, Twhomp, Goomba Walking to the Left, Goomba Walking to the Right, Goomba Walking to the Left, Goomba Walking to the Right, Bowser spitting fire, Bowser punching and... a Japanese flag.
Luigi: What does that mean?
Mario: Hmmm, I think I already know.
He goes to his computer and types 'Up, Up, Down, Down, Left, Right, Left, Right, B, A' and the door opens.
Yoshi: How did you found out Mario?
Mario: It was just a guess.
In the following area:
Mario (reading a sign): You'll only pass if the amount of fruit you guess.
Luigi: There's a lot of fruit in that box, it's going to take forever to figure it out.
Yoshi: Leave it to me.
He takes the box and eats all the fruit.
Yoshi: There, zero.
The door opens.
Mario: It's an elevator.
Luigi: But there's only room for two.
Yoshi: You guys can go, I'll stay here and slow them down.
Mario: Okay, thanks Yoshi.
They go up in the elevator and arrive at the castle's top floor.
Mario: If we go through here, we'll find Bowser. (he tries to break the door but nothing happens) but, this thing won't open.
Luigi: I know, we need more energy.
He starts charging an eletric attack and shoots something that seems to be connected to the door.
Mario: Well done, Luigi.
Luigi: Go, I have to hold this thing, you go and defeat Bowser.
Mario: Okay, thanks brother.
Mario leaves and goes to Bowser, while Luigi keeps the door open.
Peach: MARIO!
Bowser: So you came Mario, I didn't think you could, but now it's time for the most difficult challenge, you must defeat me.
Mario: Let's do it Bowser.
Mario Vs. Bowser:
They start punching each other, but soon Mario starts to take advantage with his spinning attacks and his hammer, Bowser doesn't give up and starts attacking with his shell causing some damage to Mario, Mario responds with a fire flower, but Bowser hits the fireballs with a tennis racket, Mario does the same with his hammer and the two start playing tennis with fireballs, Bowser enters his shell and sends the fireballs back to Mario at high speed, which causes serious damage to him, making him lose the fire flower, Bowser starts to laugh thinking he won, but Mario takes advantage of this distraction to use a feather which gives him the hability to fly, he flies, grabs Bowser by the tail and throws him into the lava, but Bowser uses the Super Mario World helicopter and throws a large rock at Mario, he knocks it back with the hammer destroying the helicopter and making Bowser fall in the lava.
Mario: I did it, now just save Peach.
Bowser: It can't be, he did it again, that's making me... FURIOUS.
He transforms into Fury Bowser.
Fury Bowser: NOW THAT YOU DON'T HAVE THAT STUPID BELL TO SAVE YOU IT WILL BE THE END FOR YOU.
Mario: I don't have the Gigabell, but I still have THIS. (he uses a Hammer suit and transforms into Hammer Mario).
Hammer Mario: TAKE THIS.
He throws a bunch of hammers at Bowser, but it has no effect.
Fury Bowser: PATHETIC, NOW IT'S MY TURN.
He spits out a huge fireball that passes trough Mario, who doesn't feel a thing because he has hidden in his shell.
Hammer Mario: All right, let's try this.
He throws two hammers in the air, takes two mushrooms and throws them at the hammers making them giant, he then throws these giant hammers at Bowser, seriously injuring one of his eyes.
Fury Bowser: YOU HURT MY EYE AND FOR THAT YOU'LL PAY THE ULTIMATE PRICE.
He grabs Mario which makes him lose his power-up, after that he swallows Mario.
Mario: Mamma mia.
Fury Bowser: YES I DID IT, I FINALLY DEFEATED MARIO.
Mario (inside Bowser's body): There's only have one thing to do. (he picks up a bell and turns into a cat)
Turned into a cat, he began to climb inside Bowser's body until he reached his brain.
Mario: I can't take it anymore, I'm going to do what I should have done a long time ago.
He starts hitting Bowser's brain until it's totally destroyed, then he comes out of Bowser's mouth.
Mario (looking at his former enemy's body): I didn't want to do this, but you forced me to.
He takes off his cat clothes and goes to Peach.
Peach: Thanks for saving me Mario (she gives him a kiss).
Mario: Princess, I know you refused the other time I asked you to, but... (he kneels down and takes a ring from his pocket). Princess Peach, will you marry me?
Peach: Yes, yes I will.
And so Mario and Peach got married.
So that's it, Mario and Peach got married and Bowser is dead, end of story... just kidding, after all the protagonist isn't even born yet, he's only born IN THE NEXT CHAPTER.