Following the acquisition of the second Power Star and the resulting awkwardness, Mario and Amy went forth to recover the remaining four Stars needed to open that accursed door. In the search, they raced an odd turtle man at the king's mountain, struggled to stay stable on a slippery ice covered slope, trudged up a series of steps atop a tall peak, and dove through a sunken pirate's ship. After all that, they finally had six Stars and could open the door. Returning to the castle, they rushed for the door.
When they reached the door, the bellowing voice spoke once more, "Only those with one hundred and six stars may enter this door! Ha ha ha ha!"
Sure enough, the door suddenly had the number one hundred and six on it. Mario looked down to the floor and gave a faint, "Mamma mia." While Mario seemed defeated by the door's sudden betrayal, Amy had another plan in mind. She summoned her hammer and bashed the door until it fell from its hinges. Mario looked up overjoyed, and the two ran into the room.
What they saw inside was less like a room and more like another dimension, with energized clouds swirling around against a dark background. In the middle of the room stood a single Warp Pipe, its bright green exterior contrasting wildly with the dark surroundings. Amy and Mario looked to each other before both nodding in confirmation and leaping into the pipe.
On the other side, there was another void filled with energy clouds like the one near the Pipe entrance. The difference was that they now seemed to be standing on a dark star that floated in the void. Across from her, Amy spotted a large cage containing a lanky human wearing clothes almost identical to Mario's, save for the fact that they were green rather than red. Guarding the cage, there seemed to be a massive bipedal creature which looked like a cross between a turtle and a dragon. The monster noticed the pair and turned to face them.
Mario stepped forward, his hands clenched in fists of rage as he said, "Bowser! I should have known it was you! Let Luigi go now!"
"Wait, I have to say something first." The monster spoke, somehow without moving its mouth and with a strangely muffled voice. Suddenly, the creature's hands reached up to its jaw as it seemingly removed its own head to reveal a large faced human with a thick moustache and a yellow cap similar to Mario's.
"It's a me, Wario!" the man shouted, a wicked smile forming across his face. "You'll have to give me all your stars and coins!"
"Robotnik! What are you doing in this world?!" Amy interrupted, misidentifying the man.
Wario looked understandably confused as he reaffirmed, "Um no, it's a me, Wario!"
"You can grease down your moustache, put on a hat, and go by a fake name if you want, I won't let you get away with this!"
With that, Amy summoned her hammer and charged the suited man with her signature élan. Wario grabbed her hammer and bashed the hedgehog back with terrifying force. It was in that moment that Amy realized that this definitely wasn't Doctor Robotnik. Robotnik was fat, evil, and had a questionable moustache, but he couldn't hit that hard (or even fight at all without some over engineered Mecha). Wario turned back to face Mario and laughed.
"You'll regret that!" Mario said, clearly enraged by the sight of harm coming to Amy. Reaching into his pocket, Mario pulled out something that looked like a red and orange flower.
Wario clearly noticed this, as he raised an eyebrow and said, "A Fire Flower? There shouldn't be any of those around here!"
"It's a keepsake I keep on me in case of something like this!" as Mario said that, he lifted up the flower before it disappeared, and he was enveloped by a brief pulse of light. When the light cleared Mario's outfit had changed color, now appearing white and red.
In an instant, an orb of fire appeared in Mario's hand, and he hurled it towards Wario with terrifying speed followed by several others. Wario didn't seem to be intimidated, as he rushed forwards, the fireballs merely burning away some portions of his costume with no damage before he hit Mario with a strong punch to the face, knocking him back to the ground besides Amy.
Wario cackled and spoke, "So, are you ready to give up those stars now?"
Amy looked towards Mario and asked, "I'm not sure how we can beat this guy. Have any ideas?"
Mario was briefly lost in thought before his eyes lit up and he finally replied, "Yes, I think I've got something!"
After explaining his plan, Amy nodded in agreement and the two stood up. Amy raised her hammer for an attack and Mario grabbed on as well. The two charged Wario together, who looked very confident until Mario used his power to envelop the hammer in flame, preventing Wario from blocking. When the blow was struck, Wario was sent back with such force that he flew off of the darkened star and into the void below.
With the fight won, Amy and Mario let out a triumphant cheer before meeting each other's gaze. Having finally realizing the feelings that had been developing over this long journey, the two slowly moved closer and closer before their lips finally met and they sunk into a warm embrace.