Our heroes looked at Bowser with angry looks on their faces and were in battle positions ready to fight Bowser one last time in his epic finale of the show. But after he said that it was time for Bowser's Rage Stage the ponies were a little confused by that.
"Rage Stage? Exactly how are you going to do that?" Rarity asked.
"Oh wouldn't you like to know? Well the last time I tried planning a concert was in the Flower Kingdom. Of course those pesky Marios ruined everything! But this time I will be sure to destroy every last one of you! So let's begin!!" Bowser said.
He then pulled out a blue flower known as the Wonder Flower!
"Mama mia!! He's got the Wonder Flower!! Everyone off the stage!" Luigi said.
Everyone did as they were told and then they saw Bowser placed the flower on his chest. And began the final transformation. While that was happening the Blazing Koopas were merging and playing at the same time.
https://m.(Stop at 2:42 and skip to 3:46 to continue)
After the first part of the song was over we see the light dying down and revealed what Bowser transformed. He merged with the stage and the symbol glowed green eyes and came off with hands following on a sinister smoke and smiled wickedly at the ponies.
"Once again I thank you all for coming. Especially you MY LITTLE PONIES!!! This finale will soon make the whole universe my captive audience!! And now the moment you all been waiting for! It's time for BOWSER'S RAGE STAGE!!!! HIT IT BOYS!!" Bowser yelled.
After he said that it began the final song. And Bowser started singing.
Once he started that began the final battle. The heroes charged into battle and trying attacking him but it seemed like he was indestructible.
"How tough is this guy!? I can't seem to hurt him!!" Rainbow asked.
"Maybe we gotta try hitting that pink button under his chin?" Pinkie wondered.
She pulled out her party cannon and got inside and launched herself at it and once she pressed it that did damage to Bowser and cracked some of his armor. The girls saw that and now had a plan.
"Pinkie! That's it! We gotta keep hitting that button under his chin!! We do that and we can sure damage him!" Applejack said.
So the girls and the Marios all tried their very hardest to stop Bowser but he had some tricks up his sleeves. He blasted some flaming music notes at the heroes and they panicked but luckily the Mario Bros grabbed the girls and jumped so high that the notes couldn't get them. Then Mario and Luigi threw Applejack and Rainbow towards Bowser and AJ punched him in the eye. He yelled in pain clutching it while Rainbow flew under his chin and hit the button twice causing the armor to crack more. Which ends the first verse.
(Stop at 6:34 before continuing)
"Ok that smarts! But even so you cannot stop me! Try and keep up!!" Bowser shouted.
With that said he made another claw appear and continued singing. He then tried slamming his fists onto the heroes but they dodged every slam Bowser made. Then Rarity used her magic and blasted at the button and caused his armor to crack again. Outraged Bowser summoned more flaming music notes and tried attacking the heroes again. But the Marios did the same thing again. Then Pinkie and Fluttershy both decided to try and hit the button. She did and followed by Pinkie blasting herself out of the cannon and hit it once more causing the armor to crack again and almost revealed Bowser's smoke face.
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"Grr. So that's how you wanna play it huh? Well I guess I better step it up a notch!! Time to FINISH THIS!!" Bowser said.
He roared so loud that he turned the sky into a sinister orange and grew a final hand and began singing the next verse. The battle was getting intense as Bowser threw some spike balls and flaming music notes at the same time! He then tried slamming his fists onto the heroes again but they dodged. After about 10 minutes he tired himself out and gave the heroes a chance to attack. First Rainbow hit the button, then she flew into Bowser's eye and punched it causing him to yell in pain. Then Mario threw Applejack straight at the button and hit it again, then for the final blow Pinkie went in the cannon and launched herself at it and once she hit the button all of Bowser's armor exploded and now his face is no longer protected and a huge button is on his head.
Bowser growled and charged at the heroes in blind rage. But then the Marios used Fire Flowers and created a huge wave of flames and stop him in his tracks. Then the Mane Five all together decided to all jump and stomp on the button to finish him off which ended the song. Bowser groaned and when he felt his head....
"Uh oh."
Then the power of the Wonder Flower began exploding of of his head as he yelled in pain and defeat. And cracks began forming on him which caused Bowser to be engulfed into a bright light and all we see is a white screen as Bowser's cries grow quiet. When the light died down we see Bowser back in his normal form, and the stage unmerged from him while laying on the ground defeated. He opened his eyes and saw the heroes staring at him.
"Grr. I can't believe I'm beaten again. This was so not the way I predicted." Bowser groaned.
"It's over Bowser. Your show is finished, Ponyville is not yours for conquering, and we defeated you just like always." Mario said.
"This isn't over Mario bozos. You may have defeated me and ruined my Bowser Bash but this is far from over. Mark my words when we meet again. I'll be back!!! Troops! Let's roll out!" Bowser demanded.
So Bowser and all his troops began walking back to the airships and once the last minion entered they all took off and left Equestria for good but the Marios knew they'll be back soon. The girls smiled at them and thanked them for helping.
"Thank you Super Mario Bros. We really owe you guys one for stopping Bowser and his troops." Fluttershy said.
"Anytime. Well we gotta head home. But we will see you again someday. Bye bye!!" Mario said as he and Luigi took their leave and the girls were happy that all this was over. But then they realized something.
"Girls. We gotta check on Spike and Twilight!" Rarity noticed.
Then the Mane Five all went to see if Spike and Twilight were okay. Especially after everything that happened.