Spike and the others did their best to stop Cosmos. But most if them were turned into statues while others were turned into different animals. Spike and Discord were the only ones who had to save the day and free their friends from that monster's control.
After being hit with a strong right hook to the face, Spike was knocked away from her and shrank back to his normal size after using his greed to grow big and bring back Twilight from the mind of Cosmos in the first place. That was all on his mind; bringing her back, his sister, will make him the most happiest dragon ever.
Discord teleported to Spike's right and helped him get back up to his feet. Then, he whispered into his ear, and told him what to do: eat the gemstones after Discord distracts his ex-fiance and retrieves the ones on her hooves, forearms, her collar, and her forehead.
After retrieving the ones on her hooves and her forearms, Cosmos turned Spike into a wingless puppy. But that didn't stop them from saving their friends from Cosmos's control.
"Discord, why did you betray me?! I thought we were fiances?!" Cosmos shouted at Discord, who was now tall as 10 foot building. And he was holding her wrists really tight.
"I was afraid of you when I saw how merciless you can be. So, yeah, consider yourself betrayed," Discord said as he used his tongue to grab the last gemstone, and then threw it over to Spike, who caught with ease with his mouth and gulped it down. Then, Cosmos shrank back to her actual size while saying "no" and fell on her belly as all of the creature's minds that she took over flew out of her body and were set free. Everyone else where put back to the way they were. Even Spike the dog. Then, Discord used a strange box, while dressed as some kind of exterminator, and trapped her within the box, teleported to the moon and released her there. Then he came back. Spike and Discord looked at each other and high fived each other using Spike's left paw and Discord's lion paw. Everyone cheered for them. Then, the dragon and draconequs looked behind themselves and saw Twilight, Celestia, Luna, Zecora, Big Macintosh, and Cadence waking up and seeing their surroundings while Luna was confused as how they were all in the Crystal Empire. Then, they remembered what happened, especially what happened to themselves while they were trapped within that monster's mind.
Twilight got up and started galloping towards the heroes with tears in her eyes. The other members of the Mane6 started to run towards their friend. But, when they got close, Twilight used her magic to disappear... and reappear in the air as to catch her little brother into a hug, which he accepted and started to shed tears of his own; he got his wish, he got his sister back. The other members of the Mane6 looked in disappointment, but remembered that Spike was mostly devastated. So, they shrugged their shoulders together.
Shining Armor and Flurry Heart were no longer white and pink bunnies. Then, they saw Twilight, ran over to her and embraced her in a hug, while she was hugging Spike. Then, Shining Armor let out a tear-filled laugh of joy while shedding tears when he saw his beautiful wife running towards them. They all reunited. Spike got his sister back as well as Shining Armor, too. He and Flurry Heart were also joyous when Cadence was returned to them.