Inside Miss Bustier's classroom, everyone was doing their part in making a movie. Right now the two main characters were being played by Adrien and Mylène.

"Agent Smith, it's too dangerous! We must evacuate!" Adrien acted.

"You're suggesting we run, Officer Jones? After it devoured my family, my friends, even my beloved dog, Sniffles? Never! I won't run! I no longer fear it, I'm going to face it, then I'll-" Mylène was doing great in her role, but she was startled when she saw Ivan in his monster costume. She hides under the desk since she was afraid.

"Sorry Mylène." Ivan takes off his monster mask. "Mylène! That's like, the tenth take, and we're only on the first scene!" Nino stopped filming. "Fourteenth actually. But who's counting." Alix corrected. Nino groans tiredly.

"I'm... sorry. I'm gonna do better on the next take, I promise." Mylène apologized. "Anyone want some tea?" Rose tried to cheer everyone. "You're playing a hero from the special forces. You're not supposed to get all freaked out!" Nino tried to explain Mylène's role to her.

"I know, but... that monster mask he's wearing is so... realistic and scary!" Mylène tried to explain why she was so scared. "Just big ol' me, Mylène. Nothing to be scared of!" Ivan tried to cheer her up by playing with his mask.

"You ask me, he doesn't even need a mask!" Chloè mocks as she and Sabrina laugh. To make them stop laughing, two balls of paper were thrown at him. They looked at the direction of where the paper balls came from. (Y/n) was whistling innocently as Marinette and Alta were giggling quietly at what she did to them.

"Ivan, put the mask back on, you're playing the monster! And Mylène, we need you to stay in character!" Nino instructed. Ivan puts his mask back on, but it causes Mylène to be frighten again.

"I need to sing my happy song, it always makes me feel better..." Mylène begins to sing. "Smelly wolf, smelly wolf, stinky breath and slimy--" She accidentally bumps into Adrien and she got scared again. "And the Oscar for best pathetic scaredy-cat afraid of its own shadow goes to... Mylène!" Chloè laughs at her again. Adrien tried to comfort Mylène. He glared at Chloè. "Chloé, seriously?" Chloè didn't even cared. "Yeah, so what?" Having enough, Mylène quickly runs off, crying.

"Mylène, hold on!" (Y/n) calls out to her. "Anyone gonna go after her?" Marinette said. "Mylenè, wait!" Ivan takes off his mask and runs after her. After he went after her, Nino began to argue with Chloè for ruining everything...again. Especially for making fun of Mylène.

"Epic, Chloé! Just epic! What are we supposed to do now without our leading actress?" Nino angrily questioned.

"Who needs her, anyway? She was totally lame!" Chloè comments.

"You're lame! Mylène is crying her eyes out on the bathroom thanks to you!" Ivan enters inside the classroom as he told off Chloè.

"Me, lame?"

(Y/n) walks over to Ivan as she tried to calm everyone down. "Okay, everyone! Calm down. There's not time to fight." Marinette joins her. "You're right, Chloé is lame. And (Y/n)'s right, fighting isn't gonna bring Mylène back. I'm the producer, and I'm gonna do everything in my power to finish filming tonight!"

"The deadline for the Parisian Student Short Film Festival is tomorrow evening, precisely 26 hours, 15 minutes and 14, 13 seconds from now." Max explains.

"Thank you, Max, buddy." (Y/n) thanked. "We're still have to a long way to go. we still have editing, post-sound, soundtrack..." She began to list everything they needed to do from her notes. "And who's gonna take Mylene's part?" Adrien asked.

"Um, me of course!" Chloè volunteer.

"You haven't even read the script!" Alta argues.

"Of course I have! The first scene anyway. I can even tell you that it ends with a kiss between Agent Smith and Officer Jones!" Chloè explains as she goes near to Adrien with a flirty smile.

Marinette screams as she imagines Chloé and Adrien kissing. (Y/n) stared at her best friend as she could practically see the horrible images running threw her head. Alya joins as she pokes Marinette's cheek. "You wrote that?!" Marinette gripped.

"Hold up!" Alya views the scripts. "I didn't write that!"

"Uh... I wrote it. It was just a little tweak. You know, to move the story forward." Nino admits.

"What! You edited my script without even telling me? That's low!"

"Wait a minute! You mean our script!"

Adrien sighs tiredly. Rose gives him a juice to cheer him up. He thanks her. Before he could take a sip, Chloè steals it from him. "Oh, who cares who wrote what? We've got to film this thing, right?"

"She's right. Principal Damocles is only allowing us to use school until 6 p.m. sharp. Which leaves us 9 hours, 12 minutes and 12 seconds. 11, 10, 9, 8, 7, 6..." Max begins to count down. "Max, buddy. We get it, thanks" (Y/n) stopped him before he could go on.
Marinette grabs hold of (Y/n) and Alya. "Adrien and Chloé kissing cannot happen! No way!"

"You'd think I want to see my friend kiss that brat? It's a totally nightmare not only to me but for everyone in here." (Y/n) agrees with her best friend.

It makes no sense story wise anyway. The main character's emotional journey..." Alya explains.

"Hold on!" Marinette runs to where Adrien is. "We can't let Mylène just leave just like that, it's... wrong! We all chose her to play the leading female role! And... we're all in this movie together! She needs our support. I'm gonna go find her and bring her back." She volunteered to go look for Mylène. (Y/n) joins her. "I'm coming too. I'm your assistant after all and it's my job to help you out." They began to leave but Chloè mocks them. "Always trying to save the day, aren't you, Marinette and (Y/n)? Good luck finding the filthy hole that scaredy-cat's hiding in!"

Now, (Y/n) really wanted to hit Chloè but Marinette stopped her and help calm her down before she could lose her cool. The two began to walk towards the restroom. Once they made it inside, they tired to find her, but they spotted something else. There was something covering the mirror. It was a strange pink goo. (Y/n) grabs her pin as she examines the strange goo by picking at it. Marinette and (Y/n) were beginning to get worried. Suddenly, Alya entered the restroom. "Marinette! (Y/n)! Did you guys find Mylène?" She asked. "I'm afraid we didn't." (Y/n) shook her head. "Well, you better come ASAP, producer! There's some serious lip puckering about get going on!" Alta explains. Hearing the news, they quickly leave the bathroom to save their friend from an awful kiss from a certain brat.

They made upstairs. Marinette could see Chloè about to kiss Adrien, but she opens the door in time. "Cut!!!"

"Marinette, what gives? We're in the middle of a shoot, and I'm the director, FYI. I say cut, no one else. Comprende?" Nino told.

"And I'm the producer! Mylène's supposed to be the star of this movie."

"We're out of time, and from what I can see, Mylène is MIA. Let's take it from the top, people."

"This is beat! Agent Smith does not need a man in her life right now! Sniffles just got munched right now, remember!" Alya joins in the argument. "Do you wanna finish this film or not?" Nino was beginning to get tired.

"Then let's just make Agent Smith a nurse instead! That'll fix everything." Chloé puts in her idea. "Excuse me, but how does that make things better?" (Y/n) crossed her arms. "I don't know, but I'm sure I'd look amazing in a uniform."Chloé's idea was not very helpful. Everyone began to argue about the script and how it should be played out. (Y/n) and Marinette began to calm everyone down. Marinette got an idea to get rid of Chloé.

"Your nurse idea's perfect, Chloé!"Marinette said.

"Of course it's a perfect idea. Because it's mine!" Chloé brags.

"But Chloé, you don't have a uniform." Marinette blinks innocently.

"Right! Which is why that idea wasn't believable in the first place." Alya reasoned.

"I think you and your assistant should go down to the nurse's office and try out some uniforms." Marinette told. "Hmm. Kim, Max, come with me. You've just been promoted to wardrobe and bodyguard." Chloé orders. Finally, she and her group leaves.

"Nice going, Miss Producer! Now we have no lead again!" Nino said.

"Its's actually a good thing  because Chloé is gone." (Y/n) smiled.

"And now what?"

"I say we go find Mylène! She's got to be here somewhere!"

"I told you. Tick tock, there's no time, we need a lead now!"

Alya joins in the conversation. "Marinette can do it!" Marinette was shocked at this. "What?! No! I can't act. I'm... the producer." (Y/n) and Alya pulled her into a small huddle. "Don't you want to kiss Adrien?" (Y/n) whispered. Marinette looks at Adrien. "Yes, but not like this." They decided to take a break as they were sitting by their desks. "I'm only doing this as a favor, you know? As soon as Mylène comes back, she'll have her old role back." Marinette convinced herself. "'Course she will, chill out, and just think. After tonight, you'll finally have kissed Adrien..." Alya teased. This resulted with Marinette hiding behind a script as her two best friends giggled at her reaction.

Now, Marinette was with Adrien as they were getting for their kissing scene. Hiding her phone behind her notes, (Y/n) gets ready to record everything so Marinette could react to their kiss. She had her fingers crossed for luck for her best friend.

Alex got them ready. "Horrificator, take 16..." Nino started to record. "Action!"

"I'm not scared of that monster, officer Jones!" Marinette acts. Adrien pulls her close so they could kiss. Before their lips could touch, Chloé opens the door, interrupting them. "Cut!!! I knew it!"

"What did I say about other people saying cut?!" Nino yelled.

"Well played, Marinette! All that speech about working together, then you stab me right in the back! Well, your stupid little movie won't make it into the festival if I'm not in it, because my daddy is one of the judges!!" Chloé began to complain out not being able to kiss Adrien. Suddenly, screaming was heard in the building. "Did you guys hear that?" Adrien asked. "If this is another one of your silly ploys to get me out of the way, you can forget it! Besides, I—" Chloé was interrupted by the scream again.

"Okay, I know that I'm not the only one who heard that. It sounded like Kim and Max." (Y/n) said.

Everyone began to search for Kim and Max. As everyone was looking around, Nino began to film everything. (Y/n) and Marinette noticed the same pink goo from the bathroom. They noticed, an armband. It was Kim's! Everyone began to panic about them vanishing, but Alya thought they were playing a sick joke on them. "We should go to principal Damocles' office and tell him what's going on!" Marinette told. "Nino, quit filming! Its not helping!" (Y/n) glares at him. "Not a chance! This is just getting good!" Nino continues to film. He noticed that Adrien was walking away. "Yo, Adrien! Where are you going?" Adrien turns to his friend. "I left Officer Jones' jacket back there! Should probably wear it in all the scenes." He left to get his jacket. Everyone goes upstairs to see Mr Damocle is okay. (Y/n) stopped in the middle of stairs. She unwraps her flannel from her waist and drops it on the stairs. She quickly found a hiding spot. Bitz flew out of her hair. "Why did you takeoff your flannel, (Y/n)?" He asked. "I have to make them thing I went missing too, so I can transform." (Y/n) replied. "Smart thinking." Bitz smiled.

"Bitz, fly in the night!" (Y/n) begins to transform as Bitz enters her choker. It reveals a glowing bat with five pieces on it. (Y/n) crosses her hands over her face as she claps her hands together as her light purple suit morphs around her. She places her hands on her head as bat ears appear and putting her (h/c) hair in a high bun with two strip of hair in the front. A light purple, tessen fan that is similar to a bats wing appears in her hand as she slashes the air and poses with the tessen in front with her as her other hand was crossed over her stomach.

Chiroptera saw that the school was covered in a strange goo. She noticed Cat Noir tried to find a way out of the goo. So far he had no luck. She joins him and tries to slash her way out with her tessen fan, but nothing. They had no luck. They decided to go find anyone that might need their help.

Everyone was looking for Mr. Damocles, but he was missing too. What's worse is that the room was covered in the strange goo. No surprise that Nino was continuing to record everything on his phone. "Anyone seen Agent Smith? Yah, I mean, Marinette." Nino asked. "(Y/n)'s gone too!" Rose exclaims. Everyone goes outside to search for them, but they found something else. Alya spotted Marinette's phone and Nathaniel found (Y/n)'s flannel by the stairs. Everyone began to notice that they were trapped inside the school thanks to the pink goo. They try to get a cell signal, but still nothing. Before anyone could get scared, Ladybug appears. "Is everything okay?" She asked. "Ladybug in my movie? This is legit!" Nino was excited. "And on my Ladyblog!" Alya joined in.

"We've got to calmly evacuate the building, okay everyone?" Ladybug instructed. Then Cat Noir and Chiroptera appears at the door. "Uh-uh, easier said than done, Ladybug!" Cat Noir said. "He's not kidding, LB." Chiroptera had her arms crossed. "Double legit!" Nino got more excited.

"Chiroptera and I tried to cut through the goo, but it's no good. Totally indestructible. So, looks like we're trapped inside the school for now. Just stay put and try to relax, guys." Cat Noir lead the two heroines away. "Shall we take a stroll, my lady and batty? We both know that Hawk Moth's taken another innocent victim somewhere at school."

"And there's only one way to get rid of this pink goo and get everyone outta here. Capture that victim's akuma." Ladybug told.

"Exactly. I love it when you read my mind..." Cat Noir flirts.

Seeing Ladybug getting annoyed, Chiroptera bonks him in the head. "Don't you know its never a good idea to have romance when you're in a horror movie?"

"Chiroptera's right and we better find this thing first, and its prisoners." Ladybug said. Cat Noir stopped rubbing his sore head. "Wow! You did it again!" Nino gets closer to the trio. "Don't mind me, finding the missing peeps and solving this crazy mystery with Cat Noir, Chiroptera, and Ladybug... This movie's gonna be so swank!" Ladybug began to lead the group. "Stay together, right behind us!" Chiroptera saw Nino continue to record. To make sure he was with the group, she grabs hold of him. "She means you too, Spielberg!"

Everyone was trying to find Max and Kim as they tried to stay within the group. Chloé decided that she and Sabrina were better off without them and they left to hide somewhere else. They entered inside the class where they were first shooting their movie. Once they were inside, Ladybug spayed something. It was a shoe on the ground.

"Anyone recognize this shoe?" Cat Noir questioned. "That's Adrien's shoe!" Nino exclaims. Chiroptera kneels down as she examines the shoe. "That's strange. I don't see any slime here." Nathaniel was kneeling next to the teacher's desk. "Yes, there is." Suddenly,something grabs him. The desk is thrown and it reveals the new villain, Horrificator. "Heeelp, help, help!" Nathaniel shouts.

"Everybody run!" Ladybug orders, The students run off, all except for Juleka. "Awesome." She smiled. Horrificator roars at Juleka, but she wasn't even scared. "So awesome." Seeing Juleka brave around her, Horrificator shrinks down. She spits goo at Juleka, but Chiroptera grabs her away just in time and leads her back to the group. Nino was grabbed by Ladbug as Cat Noir fights Horrificator.

"Eww! What's your name, Drool-lator?" Cat Noir jokes. Horrificator spits goo at him, but he avoids it with his staff. "Cats aren't afraid of slimy toads like you!" He continues to dodge the goo.

"We better hurry and find out where that akuma's hiding!" Ladybug said.

"That could be a challenge because I can't see it!" Chiroptera exclaims.

Horrificator spits goo at them, but they avoid it. They got out of the classroom and into the court. Horrificator follows them as she continues to hold Nathaniel hostage. Horrificator sees the other students, who hide from it in fear. From the fear, she begins to grow. Ladybug noticed it. "Fear! It's fear that gives it its strength!" Horrificator spits goo at the heroes, but they avoid it. Ladybug goes to ties her foot with her yo-yo. Cat Noir and Chiroptera try to attack it with their weapons, but Horrificator spits goo at them. Seeing that their trap, Horrificator grabs Ladybug and spins her, trapping her in goo by the basketball hope. Horrificator goes for the other students, who they screamed in fear, causing her to grow bigger. She saw Ivan and recognized him. Instead of taking him, she licks him affectionately and takes Alix. "Oh no! It's taking Nath and Alix!" Rose screams.

"The more scared people are of it, the more powerful it gets! By defeating fear, we defeat it!" Ladybug explains. "That's a good start, but maybe we should get out before this goo hardens." Chiroptera said. She nods to Cat Noir and he extended his staff to free Ladybug. Now, that she was free, Ladybug uses Cat Noir's staff to free him and Chiroptera. The quickly went to the door that Horrificator escape too, but it was shut tight from the goo.

"Did you see how it just left Ivan alone?" Ladybug questioned.

"Yeah, what's that all about?" Cat Noir was confused.

Chiroptera gasped. "The monster's got to be Mylène!"

The other students join the trio. "Where are Sabrina and Chloé?" Alya asked. Chiroptera groans. "Don't those two watch horror movies? Its never a good idea to split up. We better find them before they get captured."

Everyone began to try to find Sabrina and Chloé. Suddenly, they heard her scream and follows the screams. They made it to the classroom, but they were gone. Instead of feeling down, Ladybug told them that they could track the monster down by following the goo. As they followed the goo, they made it to Horrificator's lair, in the cellar. Everyone could see that cellar looked like from a monster movie. The other students were trapped in the goo.

"Anybody in here?" Ladybug called out.

"Ladybug, it's me, Chloé Bourgeois!" Chloé cried out.

"Don't worry! We'll get you out of there!"

"Well, hurry it up already!"

"Is everyone here? Mr. Damocles? Alix? Nathaniel?" Ladybug called out for the others. The others were calling out to her. "Adrien! (Y/n)! Adrien?! (Y/n)?!"

"Chiroptera hid behind a goo pod. "Yeah, I'm here!"

"Yeah, yeah, I'm fine!" Adrien's voice yells. "What about Marinette?"

"...Yeah, we've got everyone!" Ladybug yells. She tries to pry open the goo pod to release everyone. "Ugh, they won't budge!" The students cried for help. "Just try and calm down, we'll find a way to get you out of there!" Suddenly, Horrificator appears and spits goo to prevent their escape. Horrificator jumps in front of Chiroptera. "Okay, now I'm getting scared." Chiroptera backs away. Cat Noir throws a goo cocoon at Horrificator and she attacks him.

"Lucky Charm!" Ladybug summons her power and guitar strings appeared. "Guitar strings? Are you kidding me? Guitar, music... Mylène's song!" Ladybug uses her vision, and the things on a desktop, like traffic cones and lids, flash. Ladybug catches the desktop with her yo-yo. Chiroptera joins Cat Noir to keep Horrificator busy from Ladybug worked on her idea to stop this this horror.

"That's it. Enough's enough. Cataclysm!" Cat Noir summons his power.

"Echo!" Chiroptera summons her power. She throws the glowing orb and saw wave signals only she could see. She could see when Horrificator would spit out her goo and where she would land. Making sure she was at the right spot, she signals for Cat Noir to use his Cataclysm. He uses his Cataclysm to make the bars rusted, trapping Horrificator. Ladybug gives trashcan lids to Rose, traffic cones to Nino and Alya, Ivan a dust sweeper and tray, and a box to Juleka.

"Okay, we're all going to sing." Ladybug said.

"Wait, we have to sing?" Chiroptera asked. She felt nervous since she and (Y/n) are the same person.

"The only way to get through this to get your fear under control. You all know Smelly Wold, don't you?" Ladybug explained. Chiroptera calmed down since everyone would be singing together.

"Seriously? Smelly Wolf?" Cat Noir questioned

"Care to join us?" Ladybug gives him a trash lid and she gives Chiroptera a broom with guitar strings. Cat Noir makes a drumset with the pots and trashcan lid. Chiroptera plays with the guitar strings as she smiles.

"Okay everyone! 1, 2, 3, 4!" Ladybug begins to sing. "Smelly wolf, smelly wolf, trapped in the stinky hut..." Soon everyone began to sing along. "Smelly wolf, smelly wolf, I'm gonna kick your...Smelly wolf, smelly wolf, stinky breath and slimy drool. Smelly wolf, smelly wolf, you are just silly!" Horrificator roars at them to scare them, but she starts to shrink. She begins to shrink enough that she was no longer a threat. Everyone views over the tiny Horrificator. She sees Ivan and she leaps into his arms. He spotted something on her head. "That's the same button I gave to Mylène!"

"That's where the akuma is!" Ladybug grabs the pin and breaks it. This caused the akuma to fly out. "No more evil-doing for you, little akuma. Time to de-evilize!" She catches the akuma with her yo-yo. "Gotcha!" She releases the butterfly. "Bye bye, little butterfly. Miraculous ladybug!" She throws her Lucky Charm and everything goes back to normal. The goo disappears. and Horrificator turns back into Mylène. Ivan was glad to have Mylène back.

"Pound it!" The trio fist bumped. Nino takes on more video of the heroes, which kinda annoys Ladybug and Chiroptera. "Awesome."

Everyone was at City Hall as Nino was showing the Mayor the movie they made. In a few minutes, Nino comes out of City Hall looking gloomy. "We didn't make the cut! He said the monster was a horrible replica! Completely unbelievable! No joke!" Nino was upset. "Don't worry, bud. This is how all good movie directors start out." Adrien comforted his friend. "Yeah, even if that final kiss wasn't quite what we thought it would be." Alya said. (Y/n) nods as she gives a secret wink to Marinette. Maybe next time she could see her friend finally be with the boy she loves. Marinette smiled at (Y/n), happy to have her encouragement.