I don't own Harry Potter or Code Lyoko

Amnesia

A tower in the ice sector turned from white to red.

Science Classroom

The computer sparked and smoke went into the machine on the desk. It filled with gel and Xana took control of the nanobots inside.

Harry's and Jeremy's Dorm

Harry clutched his head.

"Xana attacking?" asked Jeremy.

"Yep. I need to do something." Harry concentrated and glowed slightly.

"What are you doing?"

"Protecting us against nanotechnology. Xana's possessed nanobots so he can wipe our memories."

"Really?" asked Jeremy sceptically. "Why would he do that?"

"When have I been wrong Jeremy? We are doing nanotechnology in science remember? I wouldn't put it past Xana to do something like that. I'll do it to the others when I have chance."

Later

"Here we have a nanosphere that the nanotech services company was king enough to lend us. Who can tell us what nanotechnology is?" asked Ms Hertz.

Herb raised his hand quickly and Jeremy calmly raised one finger.

"Jeremy, go on."

"It's microscopic-sized technology. There are nano-motors, nano-circuitboards and nano-gears," explained Jeremy.

"Exactly."

"Hmph!"

"In the medical field, scientists are developing nano-doctors," continued Ms Hertz. "Tiny machines that will be carried around the bloodstream to treat disease. It still has a long way to go though."

Can they cause amnesia?" asked Harry.

"If they were designed to do that then yes," said Ms Hertz. "But I don't see why doctors would want to do that."

"Maybe to get rid of a traumatic event?"

"Are these robots capable of fighting pimples, cellulite and things like that?" asked Sissi.

"Haha, yes they can, but the priority is for more serious illnesses!" said Ms Hertz.

"The whole class laughed so no one noticed Harry glowing slightly.

"And nanotechnology can't do a thing about stupidity! Poor Sissi, what a shame!" joked Odd.

"Alright now. Quieten down. So this nanosphere is used to make nano-devices. Huh, looks like it hasn't been cleaned properly. There's gelatine inside!"

"Looks like the greasy stuff Odd puts on his hair every day!" said Ulrich.

"If you think you're so clever Ulrich then why don't you take a sample of it to put under a microscope."

Ulrich put a slide in the dish and picked up some of the gelatine.

"The gelatine is used as a culture here the nanodevices can develop," said Ms Hertz.

"It looks an awful lot like jam!" exclaimed Ulrich.

Odd pushed Ulrich's head into the gelatine.

"Odd!"

"Sorry, but I just couldn't resist!" said Odd as the class laughed.

"Dah, I'll get you for that, Odd!" yelled Ulrich.

"This is a science class, children, not a comedy club!" Ms Hertz said as she replaced the sphere.

Outside

"Wow, nanotechnology is incredible," said Jeremy. "There's a field I'd like to work on in the future."

"Typical Jeremy," said Harry.

"I have enough trouble with normal-sized technology, much less microscopic…" said Yumi.

"Hey, that looks good! Can I have some?" asked Odd as he saw Ulrich's chocolate bar.

"Here!" said Ulrich as he squished the chocolate bar onto Odd's forehead. "I warned you!"

"Yeah, but taking advantage of my sweet tooth wasn't fair! What's up Harry?" asked Odd as he noticed Harry's expression.

"Odd has a strange mind. Anyway Xana's taken control of the nanobots," said Harry. "I sensed him in them."

"Seriously Harry?" asked Ulrich.

"I'm serious. That's why I took the precaution of protecting us."

"What protection?" asked Yumi.

"I put up a ward against the nanobots so they can't get through or they'll get fried."

Sissi clutched her head and passed out. Herb and Nicholas crowed around her and Jim ran over.

"What's up with Sissi?" asked Harry. "She was fine this morning… before the science lesson."

"I think you're getting paranoid," said Jeremy as Jim took Sissi to the infirmary. "Always seeing a Xana attack when there isn't one. We can still keep an eye out though."

Infirmary

Yolanda took Sissi's pulse. "Alright. Get some rest now Ulrich."

She opened the door and saw Harry. "What are you doing here Harry?"

"I came to see how Sissi is."

"She's better. Just sleeping."

"Can I see her?"

"I don't know…"

"I just want to make sure she's alright. I know we're not on the best of terms but…"

"Alright. But not for too long."

Harry walked in and looked at her. "I hope you recover soon Sissi."

She woke up.

"What happened? Where am I? Who am I? And who are you?" asked Sissi.

"You're in the infirmary Sissi because you fainted. I'm Harry."

"What infirmary?"

Harry frowned. "What do you remember?"

"Nothing before waking up. What infirmary?"

"The infirmary at Kadic Academy where we both go. Nothing? Nothing at all?"

"Is that strange?"

"Just unusual."

"How well do I get on with you?"

Harry sighed. "To tell the truth we don't spend much time around each other. When we do, you ask me for information about my brother who you like."

Sissi paused, remembering when she asked him for information about Ulrich and the feelings she had at that moment then pecked him on his check causing Harry to blush.

"I like you really!"

"Well, it looks like our patient is awake it seems," said Yolanda as she walked in. "How are you Sissi?"

"She doesn't remember anything," said Harry. "I'll take care of her."

"Are you sure?"

"Yep."

The two walked out of the room.

Outside

"What is this? An epidemic?" asked Jim as he walked past with another unconscious student so he could put them in the infirmary.

"That's the same thing that happened to you Sissi," said Harry. "But amnesia and fainting aren't contagious… maybe it's something else that's contagious and the amnesia and fainting are symptoms…"

Outside

"Hey Harry," said Jeremy as the two walked by. "What are you doing with Sissi?"

"Who are you?"

"This is Jeremy," said Harry. "Jeremy, Sissi doesn't remember anything."

"Really?"

"I remember a few things," said Sissi as she hugged Harry. "Like the fact I like Harry."

Ulrich and Yumi walked up.

"What's Sissi doing here?" asked Ulrich.

"She's lost her memory," said Harry. "So I'm trying to help her. She apparently likes me. Sissi do you remember Ulrich?"

Sissi frowned. "I was trying to gain his attention so I could gain your attention."

Everyone looked at her.

"Wow. You were right when you said Sissi liked you," said Jeremy. "I wonder how long this has been going on for…"

"A while," said Yumi. "I saw some pages with Harry's picture on and his name in Sissi's diary."

"Harry, can I talk to you for a moment?" asked Ulrich.

"Sure." They walked a few steps away.

"Why are you helping Sissi?" asked Ulrich.

"Because I feel sorry for her. No one should have to lose their entire memory. She doesn't know who anyone is. She didn't even know her own name," said Harry.

Ulrich thought for a moment. "Just be careful with her. She might be pulling a trick."

"I don't think she is. There's none of the body language that corresponds with lying," said Harry as they walked back.

"What are you doing with those guys Sissi?" asked Herb as he and Nickolas walked other. Sissi looked at Harry, confused.

"These are Nicholas and Herb. They are your friends. Remember?"

Sissi shook her head.

"She lost her memory after she fainted," Harry explained to Nicholas and Herb. "I'm trying to help her. Yumi, did you mention a diary?"

"Uh, yes."

"Thanks. Sissi, let's go." He led her to the dormitory.

"Wow. Sissi has had a total one eighty in personality," said Jeremy.

"Why is she hanging around that freaky Harry?" asked Herb jealously.

"My brother isn't freaky," said Ulrich.

"Sissi definitely has amnesia," said Jeremy.

Sissi's dorm

"Ah, here we are," said Harry as he picked up Sissi's diary and handed it to her. "This might help. If you want me, I'll be in my dorm on the next floor down."

Harry walked out and Sissi started to read.

Infirmary

"Do you want some help?" asked Ulrich as he entered the infirmary. "I know you have a lot of cases so…"

"The best way to help is to stay out of my way. I need as few distractions as possible due to the endemic," said Yolanda as she tended to a student and Jim.

"It's too bad the nano-doctors don't exist yet," said Odd.

"I'm going to check the nanosphere then talk to Harry. I have a felling he was on the right track when he asked about amnesia earlier and nanobots," said Jeremy. "He did also say that Xana was attacking earlier."

"And you didn't think that was important?" asked Yumi.

"There wasn't any proof at the time," said Jeremy. "And I know that Harry's never been wrong but well…"

"You want actual proof that Xana's active and Harry's not hallucinating," said Ulrich.

"Yes, that's right."

"You know, you'll have to trust him eventually."

Harry's and Jeremy's dorm

"Hey Aelita," said Harry as he sat down.

"Hello Harry. What's the matter? You look worried."

"People are fainting and losing their memory," explained Harry. "It looks like it's infectious. Xana's active. I'm sure of it."

"I haven't felt any pulsations."

"That doesn't mean that he isn't active," said Harry.

Someone knocked on the door. Harry opened it. "Hey Sissi. What's the matter? Finished your diary?"

Sissi nodded. "I'm sorry about the way I treat your group. It's obvious that Ulrich likes Yumi and I just keep getting in the way."

"Who's that?" asked Aelita.

"It's Sissi. Sissi, this is Aelita."

"Nice to meet you."

"Do you remember anything else?" asked Harry as his phone rang.

Science Classroom

"Ms Hertz?" Jeremy called as he, Yumi, Odd and Ulrich ran into the classroom. She was lying on the desk. "Oh no. Not another case!"

Jeremy put the slide on the microscope as Ms Hertz woke up. "Where am I?"

"Look at this," said Jeremy as he zoomed in on the nanobots. The robots had the eye of Xana on them.

"Looks like Harry was right," said Ulrich. "Xana is the cause of this. But amnesia? And why do we still remember?"

"That's Harry's doing," explained Jeremy. "He used his magic to protect us since he wanted to make sure we weren't affected is Xana attacked but I'm not sure how long this will last. The rest of the school is infected."

"So it is contagious," said Yumi.

"A world without memory," said Odd. "And Xana controlling it. That's scary."

Jeremy called Harry. "Harry, you were right. Go to the factory. Ok. I guess you can bring her with you. I don't think she'll remember the events of this anyway."

He closed his phone.

"What's wrong with Harry?" asked Ulrich.

"He's fine but Sissi is with him," said Jeremy. "He's taking her to the lab so he can keep an eye on her. Since we'll be going back in time, it's not really a problem."

"What if she remembers?" asked Yumi.

"We keep an eye on her, of course."

Harry's and Jeremy's Dorm

"I'll keep a look out," said Aelita.

"I'll launch the scan and make sure the results appear in the lab," said Harry. "Get to a way tower."

"What lab?" asked Sissi.

"Come with me," said Harry. "I'll show you."

He pulled her out of the room.

Outside

"Wow, people are dropping like flies," said Harry as he saw students lying all over the place.

Lab

"Wow," said Sissi as she looked at the computer.

"Sissi, I need you to keep this a secret," said Harry as he walked over to the computer.

Sissi nodded. "Of course. Anything for you." She froze as she remembered when she followed Odd to the factory. "I've been here before, haven't I?"

"What?" asked Harry, not paying attention.

"I was following Odd then he disappeared then you and Ulrich disappeared in these tube things. There was this girl called Maya… I ratted you out to my dad. But you're still doing it."

"How do you remember that?" asked Harry. "The events that led up to that have been erased… I beat it's the nanobots bringing back the forgotten memories."

Sissi looked at the ID cards. "That's you," she said as she pointed at the ninja.

"Yep." The scan results appeared. "Ok. Ice sector. Aelita, where are you?"

"I'm in the desert."

"Ok. Move to the ice sector. That's where the tower is. Hey Jeremy."

"Hey, Harry, Sissi. Harry can you transfer over Odd, Ulrich and Yumi? They're already in the scanners."

"Yep. Are you guys ready?"

"Jest get on with it," said Ulrich.

"Ok, ok. Don't get your knickers in a twist… transfer Odd. Transfer Ulrich. Transfer Yumi. Scanner Odd. Scanner Ulrich. Scanner Yumi. Virtualisation! Now transfer me," said Harry.

"No, please don't go," said Sissi desperately.

"Sissi, if I go, I can stop more people from losing their memories," said Harry as he headed to the elevator. "I'll be perfectly safe."

"Ok then," said Jeremy as he sat down. "Are you ready?"

"Yep."

"Transfer Harry. Scanner Harry. Virtualisation!"

Lyoko

"Why did you put us next to a tower?" asked Ulrich.

"That's the one Aelita's going to come out of. I think," said Jeremy. "You'll have to talk to Harry."

"Hey guys," said Harry. "Hello again Aelita. Here's the welcoming committee."

"Fifty Krabes and ten Megatanks," reported Jeremy. "Xana really doesn't want you to get to the tower."

"Xana's going on the weak side," said Harry as he defeated the Megatanks. "Aren't you going to help? I thought you wanted me to leave some for you."

"Harry, don't be reckless," said Sissi.

"I'm not being reckless Sissi," said Harry. "I move a lot faster than the monsters and I can dodge pretty much anything Xana has to throw at us."

"Yumi, you just lost twenty life points."

"I take back what I said," groaned Yumi. "If it's a really large number of monsters, let Harry take care of it. He's the most likely to get rid of them with no damage"

Harry grinned and blurred away. The Krabes exploded as one and Harry reappeared next to Yumi.

"I suggest we get moving." They started to run.

"So, how's Sissi?" asked Odd.

"She's fine," said Harry. "She remembers when we found the supercomputer though."

"Seriously?" asked Ulrich.

"Yep. I think it's because of the nanobots inside her though," said Harry. "Look. There's the tower."

"That was quick," said Yumi. "Where are the monsters? I would have expected more to slow us down."

"You spoke too soon," said Harry as a few hornets appeared. Ulrich leapt at them and cut one, destroying it. Odd hit another with a laser arrow and Harry finished off the rest with his shuriken.

"There we are…. Oh great. Xana's sent two more Krabes," said Harry as he saw them land.

"There's two more behind us," said Yumi.

"Let us take these out," said Ulrich as he jumped on top of one and stabbed it. Yumi hit another one with her fan and destroyed it. Harry concentrated and threw a shuriken which hit. "Bull's-eye!"

"Now, who's deactivating the tower?" asked Jeremy.

Harry and Aelita looked at each other.

"Do you want to do it Aelita?" asked Harry.

"Sure." Aelita entered the tower rode the virtual elevator and pressed her palm against the screen.

Aelita

Code

Lyoko

Lab

"Well, that's all other with," said Jeremy in relief.

"Now what do we do?" asked Sissi. "I still don't remember much."

"This. Return to the past now!"

The white light restored the memories of everyone effected. Well, up to a point anyway.

Earlier

"Exactly. In the medical field, scientists are developing nano-doctors," said Ms Hertz. "Tiny machines that will be carried around the bloodstream to treat disease. It still has a long way to go though."

"Are these robots capable of fighting pimples, cellulite and things like that?" asked Sissi.

"Ha-ha, yes they can, but the priority is for more serious illnesses!" said Ms Hertz.

The class started to laugh. Sissi looked embarrassed.

"And nanotechnology can't do a thing about stupidity! Poor Sissi, what a shame!" joked Odd.

"Alright now. Quieten down. So this nanosphere is used to make nano-devices. Huh, looks like it hasn't been cleaned properly. There's gelatine inside!"

"Looks like the greasy stuff Odd puts on his hair every day!" said Ulrich.

"If you think you're so clever Ulrich then why don't you take a sample of it to put under a microscope. The gelatine used as a culture where nano devices can develop."

"It looks an awful lot like jam!" exclaimed Ulrich. "Let's try to cook it! You never can tell."

Ulrich pecked up a pair of tongs, put the slide in it and put it over a flame.

"What are you doing?" asked Ms Hertz as the slide melted. "How dare you destroy school equipment?! I'll have to punish you severely for that! And it's going to be a punishment you won't forget!"

"I hope not, Ms Hertz! I sure hope not!" said Ulrich as he remembered the events that wouldn't happen.

"What?"

They started to laugh again.

"This is as bad as us finding out that Sissi likes Harry," said Odd. Sissi glared at him.

"I don't like Harry!"

"This is the first time that I've seen someone agree with a part of a punishment," said Harry. "And are you sure you don't like me Sissi? I mean, it's kinda obvious, don't you think? Ulrich is with Yumi so you go to the next best thing. Me. You do ask me for information after all."

The class started to laugh again.

"But seriously Sissi. If you want to get to know us better, don't expect us to give out information about each other. You have to ask the person themselves. If you do want to go out with me, just ask."

"Shut up Harry."

"Man, I preferred you when you had the amnesia," muttered Harry.

Odd placed his hand on Harry's shoulder. "This looks like the start of a beautiful relationship."