Since it was getting late, most of the ponies in Ponyville were at home. Twilight, Spike, and Owloysius were also at home, preparing everything for the next day's schedule.
"Are you sure you can stay up long enough to finish preparing for tomorrow's schedule, Spike?" Twilight said. "You know Owloysius can help me out just fine."
"No, don't worry. I can do it," Spike yawned. Twilight then gave him a look that showed she wasn't convinced. "Well, maybe I can go to bed now. But don't expect to fall asleep that fas—" Spike then collapsed onto the ground and fell asleep.
Twilight then used her magic and to pick Spike up and take him back to their room. She placed him in his bed and patted him on the head. "Good night, Spike," she then tiptoed down the stairs, quietly opened the door, went through, and then closed the door. "Phew...glad I was able to get back without making any noise." But then, suddenly, the whole house was shaken by a loud roar. Books fell off the shelves, Owloysius was startled and he flew into the air, Twilight fell onto the ground, and in the other room, Spike woke up in a panic and fell out of his bed.
After the shaking had stopped, Spike burst through the door and saw Twilight on the ground. "Twilight!" he shouted as he ran over to help her up. "Are you okay? What happened? What's going on??"
"I don't know! That roar came from outside! We have to go see what it is right away!" Twilight then used her magic to place Spike on her back, and she ran out the door with Spike holding onto her, and with Owloysius following behind them.
Sweetie Belle, Apple Bloom, and Scootaloo had just ran into town. They then ran into Applejack, Rarity, Rainbow Dash, Fluttershy, and Pinkie Pie. "Sweetie Belle!" Rarity exclaimed as she ran up to Sweetie. "Are you okay??"
"Yeah, I'm fine! And so are Apple Bloom and Scootaloo!" Sweetie replied as Apple Bloom and Scootaloo came up next to her.
"What in Equestria is goin' on?!" Applejack shouted.
“Umm…we sorta did something…” Sweetie said as she scratched the ground with her hoof and hung her head in disgrace, with Scootaloo and Apple Bloom also hanging their heads.
“WHAT?!?” All of the other ponies shouted in unison.
“What did yah do?!” Applejack shouted.
"Well...we were trying to practice magic, and I wanted to do an impressive magic spell, so we borrowed a book from Twilight's to find a spell to use."
"You did WHAT?!?" Everypony suddenly turned their heads to see Twilight, Spike, and Owloysius, whom had just arrived. Twilight was in total shock. "You used one of my books??"
"That must have been the book that was missing from the library!" Spike exclaimed.
"You took one of my books without asking??" Twilight shouted at the girls. "Why would you do that??"
"Well, we wanted to find a really good magic spell to use!" Sweetie Belle said.
"We didn't think that anything bad would happen!" Apple Bloom added.
"Well, that's no excuse!" Applejack scolded the girls. "Just see what yah've done!"
"Actually, what did they do?" asked Pinkie Pie.
"She's right," Applejack said. She then turned her head towards the CMC. "What magic spell did yah girls use??" Everyone else leaned in to hear what the girls had to say.
The girls looked too discomfited to say anything at first, but then Sweetie Belle built up some courage, and then took a deep breath. "The spell we used was to bring characters in books to life," She turned to Twilight. "That's why we all came to your library to get all those books earlier, Twilight. We wanted to find the right book to use."
Twilight still looked in shock from all this, but then she shook it off. "W—what book did you use??"
Sweetie Belle used her magic and took the book she used the spell on out of her sidebag. She placed the book in front of Twilight, who then used her won magic to take the book. Twilight put the book close to her face and read the title. She then gasped with an extreme sense of horror. "The Call of Cthulhu?!?" Twilight moved the book to the left side of her head and turned the cover towards the girls. "Are you telling me that you summoned Cthulhu into the real world?!?" The girls felt too horrible to say anything, but the looks on their faces showed that they indeed summoned Cthulhu. Twilight stood there with her eyes widened and mouth wide open. She then dropped the book on the ground and fell down on her rear end, which made Spike fall off.
"Wait, wait, now hold on a second," Rainbow Dash interrupted. “Who’s this Cthulhu guy?”
Twilight took a deep breath, still feeling horror-struck by all this. “To put it simply…he’s a giant monster.”
"A monster? What kind of monster?"
"He isn't," Fluttershy gulped. "Like a d-d-dragon, is he?" she said, cowering.
"No, Fluttershy. This is going to be much worse than any dragon," Twilight said, her eyes still widened in horror during this whole time.
"Well, I'm not going to be afraid of any monster!" Rainbow Dash exclaimed. "I mean, how bad could this guy possibly be?"
Then, suddenly, everyone heard a noise. The low sound of stomping. Other ponies around all stuck their heads out windows or came outside, all listening to the stomping as it got louder and louder. Twilight's face became more full of fright as she could tell Cthulhu was getting closer. Then the sound of screaming was heard, and ponies came running from behind a nearby building. The stomping was the loudest now, and then, a giant leg came out from behind the building and stomped on the ground, stopping in place. The CMC, Spike, and five of the Mane 6 looked in horrified shock at what they saw. Twilight then slowly turned her head around to see, towering above the building behind her and the others, the horrible, terrifying, and repulsive monster, Cthulhu!