Chat Noir burst into Marinette's room with tears streaming down his face.

Marinette stopped her sewing with an exasperated sigh. "Chat," she began. "Just because I unlock my trapdoor for you doesn't mean that you can just burst in without knocking first—" At the sight of Chat's face, she stopped her fussing. "Chat Noir? What's wrong?"

Without another word, Chat Noir threw himself into Marinette's chest and started sobbing.

"Shh, Kitty. It's ok. I'm here. I'm here for you." Marinette soothed as she ran her fingers through his hair. "I'm here." After a few minutes, Chat Noir's sobs turned into faint whimpers. He sounded so helpless, so wounded, that Marinette wanted to punch whoever turned her kitty into this sniveling mess. "Hey, do you want to talk about it? Or do you just want to sit for a while?"

"I'll talk about it. I need to talk about it." He sat up and looked her in the eye. Marinette...I saw an Akuma follow me on the way here."

Marinette's eyes widened. "Oh, no. Just...get it all out and focus on me. Focus on nothing else but me."
Chat looked into her beautiful bluebell eyes that held nothing but love and concern for him. He took a deep breath. "My dad is Hawkmoth." He stopped, waiting for her reaction.

"Kitty, I...I'm...Oh, Chat." Marinette pulled him toward her chest again. "Just get it all out. You can stop when you want to."

"My dad is Hawkmoth and my mom...my mom is still alive. She's unconscious. She's been under my nose this whole time. He lied. My father..." Chat growled. "Hawkmoth lied to me. He said that Mom went missing. He kept her from me. She's alive and breathing. She's alive. And he made me think she was dead. He LIED!" Chat was shouting now. "He has been torturing people. Torturing Paris to bring her back. Can't he see that there are other ways? Doesn't he know the consequences? I want Mom back. I want her more than ANYTHING. But I wouldn't want this. She wouldn't want this! He's neglected me." Chat stood up and started pacing. "He made me think that I wasn't good enough, HE ABANDONED ME!" he sobbed. WHEN I NEEDED HIM MOST, HE ABANDONED ME. HIS ONLY SON. How?" He whispered, "How could he do this to me? To us? Doesn't he know that he's not the only one mourning? Doesn't he realize that I LOST SOMEONE TOO?"

Marinette watched in fear as a black and purple butterfly silently wormed its way through the window and flew closer and closer to his bell. "Kitty," she said as calmly as she could, "Look at me, I need you to focus on me. Breathe." Chat Noir was now panting. "Chat, breathe." Marinette saw the butterfly made contact with the bell. Chat Noir's eyes darkened and a purple butterfly outline surrounded them. "Kitty!" Marinette desperately yelled, tearing up. "Kitty, no. You're better than this. You can fight this. Don't listen to him!"

It was no use. Chat Noir closed his eyes. And when he opened them, they glowed bright yellow.

"C-Chat Noir?" Whimpered Marinette.

Chat Blanc's yellow eyes narrowed. "Cataclysm," he whispered.

Ok, ok, it doesn't really show a villian, it just introduces him but still.