"So, why did you choose the name 'Chat Noir'?" Mark asked as he set the table up with Jack. They were at a local convention, hoping to promote their Cloak clothing brand by selling some items and autographing already-purchased clothes.

After lining up the table, Jack replied, "It's 'Black Cat' in French. I just thought French would sound cool."

The rest of the setup was in silence. Mark and Jack helped some of the convention staff pitch a banner behind the table. Some other staff got the duo chairs and water bottles. Now at their chairs, Mark and Jack laid out the clothing in stacks. Once everything was ready, Mark asked, "So, aren't you gonna ask about MY superhero name?"

"...Yer superhero name is Ladybug," Jack pointed out. "It's not that much of a stretch, but why didn't you go with something more…masculine?"

Mark scoffed, "I'm already assured of my masculinity, Jack, and the name 'Ladybug' isn't gonna change that."

Once the convention started, everything seemed to be going smoothly: some people bought the Cloak products on display after seeing them for real, while others got their previously-owned Cloak products signed by the creators. After about an hour at the Cloak stand, a woman brought her hoodie to the table. The woman looked to be in her early twenties, with pale skin, long blonde hair, and brown eyes. She also wore a Cloak hat, which will be important soon.

Mark asked her as he grabbed the hoodie, "What's your name, miss?"

"I'm Tandy." The girl smiled, maybe a little too wide. Mark wrote To Tandy, From Markiplier on the sleeve of the hoodie, and then handed it back to her. She took the hoodie, still smiling widely.

Then, she took out a Cloak beanie, but Mark put his hand up. "One signature per person, miss. Those are the rules."

"I-I'm sure you can make an exception…for me?" Tandy put her hand to Mark's, like she felt some sort of special draw to him. She looked Mark in the eyes, and she looked desperate, like she would not live until she got this second object signed. When he saw the obsessive desire in eyes, he realized how much worse this situation could get.

"Security!" Jack must've noticed Tandy's eyes too, because he spoke up first.

A security guard pushed his way into the line and pulled Tandy from it. He said, "You're disrupting the line."

Tandy glared at the guard, not scared of him despite his bigger size. "I paid to get in this line- you can't stop me!" That seemed to be the last straw; the guard grabbed her by the arm and took her from the line, leaving her unsigned hat on the table. Tandy shouted as she was dragged away, "I'll be back!"

"That was weird, huh, Jack?" Mark asked his friend, but all Jack did was watch as Tandy was pulled away. "Jack?"

Jack had a bad feeling about Tandy, but he wasn't sure why. Soon, he snapped out of it and responded to Mark. "Y-Yeah, weird."

Meanwhile, in a nearby, but undisclosed location, a butterfly-shaped window opened, showing the sprawling city of Los Angeles in the distance. Hundreds of butterflies flew around, disturbed by the sudden light. "Disappointed by Markiplier, and jealous of JackSepticEye- the perfect formula for disaster." A butterfly flew into his hand and as he covered it with his other hand, it turned into a dark Akuma. The Akuma fluttered out the open window and Space Butterfly said, "Fly, my little Akuma, and darken her heart!"

Tandy huffed as she was pushed out of the convention center; the guard brought her to the nearest exit, but enough people had seen her for her to feel humiliated. She put on her Cloak hoodie and huffed again. Disappointed in Mark, Jack, and herself (but only slightly), she didn't notice the black butterfly connect with her hoodie's sleeve. A purple light outlined her face and she heard a voice in her head: "Hello, Copyjack, I'm Space Butterfly. Once you get rid of JackSepticEye, you can take his place, and Markiplier will be yours forever."

Tandy smirks. "The thought of it makes me want to scream." Her body became covered in a black, bubbly mist, and when the mist disappeared, she looked exactly like JackSepticEye did at the convention. She -now he- said to himself, "Time to ruin Jack's sterlin' reputation," and then ran off to steal something valuable.

After the convention, Jack went home and got himself some dinner from the fridge. He also got some Camembert for Plagg. Jack had the news on in the background; he usually wouldn't have it on, but Plagg insisted he keep it on in case of an Akuma attack. It proved useful when the newscaster announced, "And in some astonishing news, there's been a spectacular theft at the Getty, of Lot and His Daughters. Amateur video showed, without a shadow of a doubt, that the thief is none other than the famous YouTuber, JackSepticEye."

"Wait, WHAT?!" Jack exclaimed.

On the television, Jack watched as some strangely exact copy of him stole the painting, and then turned to the camera. "Top o' the mornin' to ya," he said before casually walking away. Everyone on the video was too aghast to stop him.

"Not only is that person a fake, he's a terrible fake!" Jack got up from his couch, but already, in the distance, he could hear police sirens coming for him.

Surprisingly, Plagg also panicked, but not before stuffing his cheese into his mouth. "That guy looks exactly like you! It has to be an Akuma!"

"I've kind of already figured that out," Jack groans as he heads for the door. "Plagg, stay close to me. When I open this door, I dunno what will happen next." Plagg obeyed and floated behind his master. Jack slowly opened the door and tried not to scream at the sight in front of him. There was one policeman who looked to be the chief, because all the others were dressed in what Jack could only describe as SWAT gear. There were a few cars, and the whole group was pointed at Jack's house.

All of this for a painting!? The chief of police said through a megaphone, "Stay there or we'll have to use force!"

Jack tried to reason with the cops. "Whoa! Easy, tigers! You've got the wrong man! That thief's an imposter. I'm the real JackSepticEye!"

"There may be people who imitate you, but I'm pretty sure I know JackSepticEye when I see him steal a painting," the chief officer pointed out.

"Shit," Jack uttered under his breath. As the cops got closer to him, Jack did the stupidest thing one could do in this situation and ran back into his house. Of course, the cops followed him inside. Jack ran upstairs and fortunately, he found the ladder to the roof before the police could catch up. Jack's house had a flat roof like many contemporary houses in Los Angeles. He ran across the roof and to the edge, where his fear of heights kicked in. Even as Chat Noir, he hadn't completely overcome his fear, but he couldn't let the police catch up to him.

"PARKOUR!" Jack shouted as he jumped from one building to another, probably to lessen his other fear of falling to his death while doing so. Despite being well-trained and well-armed, the police could barely keep up with him; it looked like his training as Chat Noir was paying off. One officer nearly fell off the roof, but Jack didn't have time to worry about him.

Soon, Jack had escaped the police's stern chase, but he could still hear the car sirens not far away. "Well, I guess there's only one way to hide from these guys…" Jack secured the ring on his finger and shouted, "PLAGG, GET YOUR FECKIN' CLAWS OUT!" After turning into Chat Noir, he sighed, feeling like the giant weight of being chased for a crime he didn't commit was finally off his shoulders. "Let's see if Ladybug can help me with this…" Using his staff, he made his way across town to Mark's house.

Mark was in his room, taking a nap after the convention, but then he heard the doorbell ring. He came downstairs and answered the door. Mark looked at Chat, both thankful nobody else answered the door. Chat explained as he came in, "Okay, I don't think you've heard about what's going on, but there's a robber Jack on the loose- he stole a painting from th' Getty. I'm hidin' out as Chat Noir until we catch the thief." Chat sighed as he took it all in. "I once dated myself, but this is ridiculous."

Mark frowned as he tried to comprehend all his friend just told him. "This…is a lot to take in."

"Yeah, that sums up my feelin's exactly. You know I'm innocent, don't you, Bug-boy?"

As much as Mark wanted to say "no" as a joke, this was serious- his friend could spend actual time in jail if they didn't catch the imposter. He replied, "Yeah, but we need proof that the person imitating you is an Akuma."

"Wait, don't your superpowers as Ladybug restore things the Akuma did to normal?"

Mark nodded, not sure where Jack was going with this. "Uh, yeah, why?"

"If we can de-Akumatize this… Copyjack, the painting will end up back at Getty anyway." Chat smirked. "All we need to do is catch the Akuma, and I'll be safe!" Mark wanted to speak up, but Chat kept talking. "We should split up. Let me check out where the robbery took place. I have a knack for finding clues. You know, animal instincts." Chat Noir's cat ears flicked. "You can try to find the Akuma from evidence at th' Getty. I'm gonna try and deduce who the Akuma is and stop 'im."

Ladybug's eyes widened. "Wait, what? First, Jack, that's incredibly dangerous going on your own, since only I can capture Akumas. Second, Los Angeles is a big place, and Space Butterfly could target anyone who's upset."

"But they're obviously upset with me. What other reason would they have to become me, and then make me out to be a thief?"

"I-It could just be some angry fan, or maybe some sort of ha-!"

That's when it clicked in Chat's mind: an angry fan, and the angry Markiplier fan from the convention. She had every reason to be upset with him- he called for security to get her out of the line, after all. "It has to be that crazy fan! The one from the convention! What was her name? Tammy?"

"Tandy," Ladybug corrected him. "There still could be a lot of 'Tandy's in Los Angeles."

"Then there's no time to lose." Chat went to a nearby window and then jumped from it.

"CHAT! GET BACK HERE!" Mark yelled, but the cat hero didn't listen. Mark sighed and looked at Tikki. "We need to stop him before he does something stupid." He shouted, "TIKKI, TRANSFORM ME!" Ladybug swung after Chat Noir, trying to find out where he'd gone.

"She probably avoided goin' to my house," Chat Noir muttered as he sat on top of someone's roof, "so she must be at her own place. But where the heck is that?" He pulled out his staff and started using the "magical" Internet capabilities it had. First, he typed in the name "Tandy" on Facebook. Second, he limited the search to the Los Angeles area. Lastly, he found Tandy's profile picture. He found a clearer address, and then…he found her house.

It was a big apartment by Los Angeles standards, with multiple skylight windows across the roof. From where he was, Chat Noir easily opened a skylight and landed on the floor of Tandy's apartment like a cat. It looked normal, except Tandy wasn't around. Then, Chat noticed the painting the news thought Jack stole: Lot and his Sons. Geez, if Copyjack was the real culprit, he probably should've hidden it—even Jack knew better than to leave stolen things lying out.

"You know, I thought I was supposed to find you," someone said from behind Chat Noir. He turned around to see Copyjack, who to Chat, looked like a strange, smug mirror. "That's what Space Butterfly told me, anyway."

"I managed to track you down." Chat Noir pulled out his staff. "I tried being nice at the con, but I guess you're not going down without a fight."

Copyjack chuckled, "I didn't picture a cat as an expert tracker. How did you find me?"

"If you wanted to damage my reputation, yer first mista—!" Chat slapped a hand over his mouth as he realized he just made a mistake of his own: revealing his identity to the Akuma.

"Sean…William…McLoughlin," Copyjack growled as he got closer to Chat Noir, looking like he was staring through him, at the man behind the mask. "Do you think an Akumatized person would fall for such an obvious disguise?" The black mist overtook Copyjack's body again, and he changed into a perfect copy of Chat Noir.

The real Chat Noir glared at Copyjack. "Do you think Ladybug won't notice the difference?"

"Not if I tell him what happened first!" Copyjack pounced for Chat, but he dodged out of the way, clutching his staff tightly. Copyjack pulled out his staff, and the two of them fought with their similar weapons. Every hit was countered by the other's staff, until Copyjack managed to gain the upper hand by knocking Chat's staff out of his hands. Instead of going for his own staff, Chat Noir tried to pull Copyjack's from his grip. Copyjack feinted with his free hand and spun his staff into Chat's side while the hero was distracted. Chat grabbed the staff again, centimeters from hitting him in the abdomen.

Copyjack pulled the staff out of Chat Noir's hands and kicked him in the crotch. Chat Noir groaned, on the floor from the hit, "That was…a low blow…"

"Well, I could kill you from here…" Copyjack says, pointing the staff at Chat's head, "but one Chat Noir being dead while another runs around wouldn't be good for my image, would it?"

"Says the guy who stole my identity to ruin it," Chat groans, still trying to recover from the groin attack. Before he can recover, Copyjack grabs him and uses a roll of conveniently-placed duct tape to secure him to a wood pillar. Copyjack grabbed Chat Noir's staff and called Ladybug up.

The Akuma saw Ladybug on the other end, looking worried. "Chat, where have you been? You shouldn't have gone after Tandy on your own like that."

"I know, but I got lucky and found her place. Meet me at 22 Thompson Street."

"Don't move, Chat- I'll be there right away!"

"See you, Ladybug." After the call was over, Copyjack turned back to the tied-up Chat Noir. "I can't believe the famous Youtuber is also a semi-famous superhero." He smirked. "How did you find the time to do it all?"

"Well, it's not easy. I've had to stop uploading one video a day, an'…" Chat Noir glared at him. "Ya know what? Talk time's over. Ladybug will know the truth- he can tell the difference between you an' me like night and day."

"Stop toying around," Space Butterfly growled inside Copyjack's head, "and grab Chat Noir's Miraculous."

Copyjack sighed and grabbed for Chat's ring, but the hero stopped him. "Wait! If you take away my Miraculous, Ladybug will realize who's the fake: the one not wearing the ring, o-or the one with two rings. Plus, you can grab both Miraculous at once when Ladybug gets here."
Copyjack considered his words, and then smirked. "You make a very convincing point, but don't expect to stay Chat Noir for much longer."

Soon, Ladybug arrived by jumping into a window that was in Tandy's room. As he looked around, Ladybug found a shrine dedicated to, well, himself, as Markiplier: pictures from his earliest days on YouTube, to when his hair was pink, blue, red, and then back to black. He didn't usually criticize his fans like this, but he couldn't help but mutter sarcastically, "Oh, this isn't creepy at all."

Then, he heard two people talking in the other room- actually, it sounded like one person talking, and the other trying to talk, like they were hindered. Ladybug snuck up to the door and pushed it open slightly to observe. He saw one version of Chat tied up, with duct tape over his mouth, and another pacing around, but he couldn't exactly hear what they were saying. All Ladybug knew was he couldn't tell one Chat from the other.

Jesus! he thought. Whoever this guy is must be copying Jack down to the cells he's made of… But this gave Ladybug an idea: Copyjack probably knew Chat Noir was Jack, but he didn't know that Ladybug was Mark. The hero just needed Copyjack to screw up, so he'd know which cat was which. Then, Ladybug came into the room, trying not to look like he was just eavesdropping.

Copyjack looked at Ladybug as he came in and smirked. "There ya are."

"Well, you two definitely…look a lot alike," Ladybug commented, still not sure who was who. "Do you know where the Akuma is?"

"It's in his ring." Copyjack pointed at Chat Noir's tied-up hand, and Chat whimpered, struggling against the duct tape.

Ladybug reached out for "Copyjack's" ring but hesitated as he realized something. Wait, why would Copyjack, who was copying Jack, have the Akuma in a ring, exactly like Chat Noir? This is suspicious…

"Why are you hesitating?" Copyjack asked. "He's right there tied up with a bow! Well, I wish I had a bow…"

"I need to prove you're the real Chat." Ladybug stood up and looked at the imposter. He knew just the way to prove who he was talking to was the fake. "If you're my partner, I guess you know my secret identity." Ladybug smirked, leaning in close. "We told each other a long time ago."

"Um, y-yeah, I remember." Copyjack nodded, but Ladybug could already see through his disguise. "J-Just give me a minute. It's been a while since we talked out of costume."

"Actually, we just talked this afternoon- about capturing you, FAKER!" It didn't take Ladybug long to pin Copyjack down. "I don't know how you learned Jack and Chat Noir are the same person, but I'm gonna make sure you don't learn my identity!"

"You're so close to Ladybug," Space Butterfly told Copyjack. "Get his Miraculous!"

"Maybe I should cut out the middleman and destroy you!" Copyjack threw his hand into the air and shouted, "CATYCLYSM!" Copyjack's hand was so close to Ladybug's face that the superhero had no choice but to get off him.

Now put in a corner, Ladybug had no choice but to yell, "LUCKY CHARM!" He threw his yo-yo into the air, and from it appeared… a machete. Of all the things that could've come from the Lucky Charm, Ladybug wasn't expecting a real weapon. He looked around and a few key items turned the same ladybug pattern of the machete: Copyjack himself, his Cataclysm-charged hand, and the duct tape around Chat Noir. Ladybug smirked and pointed the machete at Copyjack. "Now I know you think I'm above physically hurting someone who messed with my partner…"

"H-H-Hey…" Copyjack slowly backed up. "I didn't want to, ya know, kill you…"

Ladybug moved forward but kept the machete at a safe distance. After several steps, he stopped walking and said, "Well, you'd be right."

"Huh?" Copyjack uttered before he realized he was now touching the duct tape he'd tied Chat Noir up in with his Cataclysm-charged hand. The duct tape fell to the floor in loose strands, now devoid of the stickiness that duct tape was known for.

Chat Noir ripped the last piece of duct tape from his mouth… which was just as painful as you'd think. "YAH!" he screamed. "Christ, that stings!" Before Copyjack could take advantage of Chat's pain again, Chat yelled, "CATACLYSM!" Chat Noir's claws hit Copyjack directly in the chest. Instead of hurting Copyjack directly, his hoodie became a shredded Cloak hoodie, which promptly fell off. From the rags of Tandy's hoodie flew an Akuma.

Ladybug shouted, "I'm freeing you from evil!" and swung his yo-yo around, grabbing the Akuma before it flew away. "Gotcha." He let the harmless go, and then threw the machete. The magic restored the painting to the Getty and repaired Tandy's shredded hoodie.

Copyjack turned back, first into Jack, and then into Tandy. By the time she was back to normal, Chat Noir and Ladybug were already making their way to a hiding spot, so they could transform discreetly. As they ran, Ladybug asked, "Do you think she'll remember your secret identity?"

Chat Noir replied, "Well, you know what they say: 'An elephant never forgets, but an Akuma always does.'"

"...No one has ever said that."