Hello guys! Let's get started for the third and final arc! Are you ready? You better be, because things shall take darker turn very quickly! But I hope you'll like and enjoy it.

Chara looked around her. The throne room… the place where everything ended. She could clearly remember how she stabbed King Asgore, her father, wihout second thoughts. After the king turned to a pile of dust, Flowey showed up, destroying the SOUL. Chara recalled how the flower was trying to reason her, begging to not kill him. He spoke to her with his Asriel voice, but it didn't affect Chara a little bit. She stabbed him over and over, until nothing was left of her pathetic brother. It was that day that she gained all the power she had now. The memories were pretty clear, even though it all happened thirteen years ago. Yet, it wasn't like time meant something in the place where she had been. There was nothing but void where the world was supposed to be. "And yet, here I am now…" - Chara thought - "A world full of possibilities. A new timeline to explore… I can't wait." Chara grinned shortly at the thought. In the "place" where she was, with the gained power from the destruction of her world, she could observe a neighbour timeline. Similar to hers, yet with a very different outcome. A timeline where Frisk decided to be a hero instead of a murderer. And now, she and all the monsters lived happily on the Surface. Including her crybaby brother, Asriel. "No, I can't allow that… not after what I've been forced to do." - Chara thought darkly, as her red eyes twinkled again - "I can't allow that brat to be happy; she's the one who took away everything from me." Chara raised her knife at the level of her face and looked at her reflection. "And my brother… he's a dirty traitor. Such a hypocrite…" - Chara's mind went on as her face turned into one of anger - "Frisk… Asriel… Everyone… They will pay for their betrayal." Chara then smiled widely and creepily - "I will make them suffer." And so, she turned around and went in the direction of New Home, that once was her home too. Chara walked around the house quietly. It didn't take great effort, considering that when she was a child, she'd sneak around the house to steal some chocolate from the kitchen in the middle of the night. Chara approached the door of the bedroom she once slept in. She knelt down and looked through the keyhole. She could see a form lying on Asriel's bed. It was Asriel himself, obviously. Even with a reduced sight, Chara could tell how much he grew up. The other bed, that once was hers, was empty. Chara quietly pulled away and walked to the living room. She looked behind a painting and found Asgore's "secret" safe. Everyone in the family actually knew about it, so Chara still coundn't understand why Asgore would even hide his money there. "The Dreemurrs always had their oddities…" - Chara mentally remarked, rolling her eyes. She then smirked, clearly remembering the code. It was an easy one, actually - the date when she fell in the Underground. "1509" Chara entered the four numbers and the safe opened. "Pff... even after all these years, he still didn't think about changing the code." It didn't take long to find what she was looking for. Asgore wouldn't notice the disappearance of 200 g, right? Chara just needed some money to buy herself new clothes. She had outgrown her current clothes years ago; it was now too small. She wasn't even wearing shoes, considering that her childhood shoes became too tight. "I'll also have to pass by the hairdresser…" - Chara noted looking at her too long hair now. Her hair no longer was shoulder-length, it now almost reaching her butt. It would've been longer if Chara didn't regularily inaccurately cut it with her knife. "Once I take care of my appearance, my vengeance shall begin." - she thought with a grin, before closing the safe.

The next day was a rainy one. There weren't many people seen outside. Just three persons were slowly walking in the park under their umbrellas, a father and his two children. Things had changed for Gaster in the last few months. In fact, after Asriel's return had been let known, Asgore and Toriel fought for a lessening of Gaster's sentence. The royal couple was too grateful to Gaster for his contribution to their son's resurrection, so they absolutely wanted to improve his life. After all, bringing back the prince of monsters wasn't a small thing. After long discussions, the human rulers decided that there would be no harm in lessening Gaster's sentence, considering that he's been behaving well since his setting to home arrest. And so, it's been about a month now that Gaster was free to go outside of his house at certain hours of the day. The advantage was that he could shop singlehandedly. The cameras hadn't been removed, since Gaster was still submitted to supervision. But it was more than enough for the skeleton, because that way he could have walks with Sam and Piper. That day was one of those. Gaster smiled as he closed his eyes and breathed in the smell of the wet atmosphere. He couldn't describe in words how he loved the rain, nor how happy he was to experience a walk in the rain again after a very long time. And the fact that Sam and Piper were with him this time… made the experience even better.
"You look very content, huh Dad?" - Sam pulled him out of his thoughts.
"Why, of course I am!" - Gaster replied - "Rain always soothed me and thus it became my favourite weather. I thought I'd never have a walk under it again after I got senteced to electronic supervision. But now, it's like a dream coming true."
"Heh, glad you're happy now." - Sam said with a smile - "Oh look! Are those Froggits over there?"
The family looked in the direction where Sam pointed out. There were indeed Froggits a bit further. They were jumping their way, without even bothering to avoid the puddles, making big splashes.
"Well, they are like regular frogs." - Gaster remarked - "They love jump in the water."
"It's true that it has its fun!" - Sam said and, seeing a puddle nearby ran and jumped straight in its middle.
"Hey, be careful Sam!" - Piper almost whined - "You're splashing on my skirt and favourite boots!"
"Oh, come on Piper, it's just water!" - Sam replied and jumed at the same spot again.
"Stop it! You'll make my outfit dirty!" - Piper cried out again.
"Sam, behave yourself." - Gaster requested, but not without a chuckle.
Sam grinned at his father, then left the puddle to return on the firm ground. Gaster looked down at his daughter and saw that she was pouting a bit. He grinned in amusement, then said:
"Oh, don't make that face, Piper. I'll help you clean your boots if you want."
"Thanks Dad." - Piper finally smiled - "You two like the rain, but I prefer the sun."
"Hmm? And why's that?" - Gaster asked curiously.
"Well… It's because when the day's sunny, the colors look so bright and beautiful, and you can hear birds sing, and you can do things you can't do when it rains, like… have fun on the swings! I don't know, the mood becomes just so joyful!" - Piper explained her reasons with a childish passion.
"Each their own, I suppose." - Gaster chuckled - "But I can see where you're coming from. You always loved bright colors. It must be related to your love of drawing."
"Probably. But I guess there's a good thing in rain." - Piper grinned - "I can show off my Mew Mew umbrella!"
"I don't like carry umbrellas, it's annoying." - Sam commented - "I prefer just put my hood on."
"You should use yours more often, though. Getting wet by the rain is an easy way to catch a nasty cold." - Gaster said seriously - "I'm glad you took it today though."
Sam's umbrella was lesh flashy than his sister's, being blue with a motif of sea waves.
"Well, I didn't want to get sick right before going on a vacation." - Sam replied, then grinned - "So I thought disobeying you for the fun of it wasn't worth it this time."
"Oh you...!"
Piper couldn't help but giggle at this. Sam would sometimes tease his father like this, which in her opinion was cute. Gaster, on the other hand, learned in the past few months to be less strict and not take everything too seriously. Which had as consequence that he'd say and take more things in good humor. It was a result of finally being more relaxed, and not constantly stressed out about hiding things from the twins (or other people). Soon, the family started to head back home and Piper then asked:
"Are you going be okay while we'll be gone?"
In fact, the next day the twins would be gone on a vacation to the beach with their mother Noelle, Frisk, Papyrus, Sans and Asriel. They would be gone for a week, and this would be the time Gaster would be alone.
"Don't worry about me, I'll be alright." - Gaster reassured her - "I'm pretty used to loneliness."
Gaster wasn't completely honest. It was true that loneliness was something he knew too well, but he half-lied by saying he'd be "alright". He wasn't used for his children be away for that long. And he wondered what he would do when they wouldn't be around. Back during the De-Code, Gaster took the twins' presence for granted and thus didn't cherish the moments as much as he should have. But now, he had to accept the fact they weren't just "his", which he did. The thought of the twins going away and having fun for an entire week without him just saddened him a little. "But at least, they're not confined in our house. They deserve to live their lives outside, go see places…" - Gaster mused - "As long as they're happy, I'm glad for them." It was with that thought that they arrived back home.

The next day, Sam and Piper went on their family trip with their mother, grandparents and great-uncles. The trip had been planned two months ago, the family thought it would be a good way to have a good time all together. Who didn't love trips to the sea? Well, Asriel was a bit reluctant at first. In fact, his parents had been insisting on the importance to go out and see actual people more often. Asgore and Toriel didn't like the fact that Asriel was confining himself in their house. It was probably because Asriel didn't want to leave his zone of comfort, after everything that happened to him between his death and resurrection. But it wasn't a very healthy thing to do, especially not for a prince. And so, when Frisk mentioned her and Papyrus' plan to go on a trip with Noelle and the twins, Toriel immediately suggested to take Asriel along. Frisk was more enthousiastic about the idea than her goat-brother was. Now, Asriel wasn't that negative about it, but he was still a bit tense. Those things took time, after all. The trip to the beach took about an hour and a half or so. They used Asgore's seven seats car that he gladly lended, considering he wouldn't need it during the few days to come. And of course, to keep on the "good mood", Sans couldn't help but tell his punny jokes.
"kids, why are skulls always single?" - Sans asked the twins.
"OH FOR GOD'S SAKE…" - Papyrus whined in annoyance.
"Why?" - Sam asked with a grin.
"'cause they have no body!" - Sans replied with a wink.
"Haha, good one Sans!" - Sam approved.
Piper giggled a little too, while Noelle rolled her eyes (though a shadow of a smile was visible on her face).
"PLEASE DON'T ENCOURAGE HIM, SAM!" - Papyrus begged his grandson.
"aw, but i had another cool one, pap! the kids will like it." - Sans said - "hey, do you know why skeletons make bad miners?"
"Hmm... I don't know. Why?" - Piper asked.
"because they only go..." - Sans started, then paused dramatically.
"Oh gosh, I know where this is going..." - Frisk shook her head.
"PLEASE, DON'T FINISH IT!" - Papyrus said with annoyance.
"...six feet underground!" - Sans finished with a proud expression.
"ARGH!"
"come on pap, i just wanna entertain the kids."
"Exactly. Sans was just kid-ding!" - Sam added, making his great-uncle's eyes shine.
"WHAT HAVE YOU DONE TO THE BOY, SANS! THREE COMEDIANS IN THE FAMILY'S TOO MUCH!" - Papyrus exclaimed dramatically.
"I understand your suffering, Papyrus…" - Asriel remarked, since he had to go through his mother's jokes often.
"Maybe you shouldn't annoy your brother with puns now. He's driving." - Frisk said with concern.
"aw, but there's still plenty of them i wanted to tell." - Sans replied with disappointement.
"You can save it for later." - Noelle said - "Mom's right, it's dangerous to distract Dad with puns when we're on the freeway."
"but... but i didn't even do the knock-knock jokes yet…"
"Okay, here's the deal. I will tell you a pun and you save your jokes for when we arrive?" - Noelle suggested.
"i'm all ears, noelle! even though i don't have those." - Sans replied with a wink.
Papyrus groaned a bit at this, but decided it wasn't worthy his remarks. He had to focus on the road. Noelle had a pun in mind, but she didn't want the twins to hear it. Or they'd ask her uncomfortable questions. Noelle leaned a bit forward, so the kids wouldn't hear her. She asked Sans quietly:
"What kind of contract provides you the best protection?"
"hmm..." - Sans mused for a moment, then said - "beats me."
"A contract-ceptive." - Noelle replied, before sitting back down on her seat.
Asriel and Frisk, who heard the joke, exchanged a look. Sans' eyesockets turned dark for a moment and sweat formed on his skull. Then, Sans let out a chuckle, that quickly escalated into a laughter. The skeleton laughed to the point he got small tears in the corners of his eyesockets. Papyrus eyed his wife, who had an amused smile on her face.
"FRISK, WHAT DID NOELLE TELL SANS?" - he asked her, since he didn't hear the joke.
"I'll tell you later, Papyrus." - Frisk promised.
"hahaha, that was a very good one, noelle...! excellent even..." - Sans said tiredly when his laughter finally faded - "now this made me all sleepy. i'll take a nap."
"THAT'S NOT A TOO BAD IDEA, SANS."
"ok, wake me up when we arrive."
It took just a few moments for Sans to plunge into a slumber. Sam and Piper exchanged an annoyed look, not liking that Noelle didn't tell the joke loudly enough. When Sam asked Noelle why, she simply replied that the joke was too complicated for a young child to understand. The twins exchanged a look, and guessed that they had to "grow a bit older".
The rest of the journey went rather calmly, yet the excitement to reach the destination was present. And when they reached the beach, the family was welcomed by a warm bright sun. It was an excellent weather to start the holiday. Later, after they left their bags in the hotel room they leased, they went to the beach. Papyrus couldn't help but smile when he saw Frisk put on her favourite summer dress. Frisk noticed and remarked:
"It's not the first time I put that dress on, and yet it still has the same effect on you."
"I JUST LOVE WHEN YOU WEAR A DRESS, HUMAN WIFE." - Papyrus replied then pulled her closer by wrapping his arms around her waist - "YOU LOOK SO LOVELY..."
Frisk giggled at this. She recalled the day they both went on a date at the beach for the first time. It was also the first time Papyrus saw hear wear a dress, since she usually wore a shirt and jeans. And he had that same look of wonder on his face. Frisk stood on her tiptoes and kissed Papyrus on his mouth.
"Lucky you, you'll be seeing me in a dress a lot this week." - she whispered to him.
Papyrus's face lit up at this. The two then looked in the direction of the twins, who were obviously enjoying themselves. It was no wonder, considering that it was a dream coming true. Sam and Piper always wanted to see the beach and sea for real and not just on tv. The De-Code didn't permit them to go see it, with or without their father. But now, they could feel the sand under their bare feet, smell the salty air, hear the sounds of the waves, run in the heat of the sun and most importantly… bathe in the sea! It was definitely not the same as taking a bath, or swimming in the pool of the sports center. Sam and Piper couldn't help but giggle and yell in joy as they let the waves carry them. Noelle was of course supervising them, sitting on the warm sand and looking through her heart-shaped sunglasses.
"Be careful to not be taken away by the wave!" - she had instructed them.
"Don't worry, Mom!" - Piper had replied - "We'll be careful!"
And so Noelle was watching her children with a smile. Who would have thought that someday, she'd go on a vacation with her children? Or even with her parents? Had she been told this a year ago, she wouldn't have believed. There weren't many things Noelle believed in a year ago. But since the twins brought her to Undertown and after everything she's exoerienced, Noelle's vision of the world drastically changed, and her faith only grew. Noelle then looked at her left, where Sans was relaxing in the warm sun. With a smile, she gently poked him. Sans opened his good eye and looked up at his niece.
"what is it, noelle?" - he asked.
"I just... feel so good right now, I wanna scream!" - Noelle almost squeeled - "It have been crazy few months, but so worthy to make through it. I'm so glad things turned out okay. And… I was wondering if you feel the same."
There was actual concern in Noelle's tone. She knew that her uncle suffered of depression. It wasn't abnormal, considering all the trials of life Sans had to go through. But Noelle hoped that after all the good things that happened recently, Sans would be able to see the bright parts that life had to offer. She wished he'd start living for himself, and not just for Papyrus, Frisk and her. Sans could easily tell what was on Noelle's mind, because she had a similar expression to the one Papyrus often had when the matter was brought up.
"kid... i can tell you're concerned about me, but i assure you that i'm fine." - Sans replied - "so, don't fill your mind with worries for me."
"Sans..." - Noelle sighed.
"i know what you want to say, and i'll reassure you." - Sans said then his smile grew warmer - "i'm probably at my happiest now…"
"Well, that's a good start." - Noelle said with a relieved look.
"but i think you should be more concerned for the ex-flower." - Sans then pointed at Asriel.
Asriel was sitting under a sunshade, his nose in a book. It looked like he wanted to hide. But was it from the sun or the people? Considering that Asriel was covered by fur, he couldn't possibly have sunburns, and the second option was thus more likely. Noelle considered to approach him, but then she saw that Frisk beat her at this.
"Asriel, what's with that studious look on your face?" - Frisk asked as she knelt down to be at his level.
"Since our parents are no longer immortal, I can't waste too much time before educating myself. I've missed so many things those past few years, after all." - Asriel replied, his eyes still locked on the book pages.
"Oh, but you have all the time in the world to educate yourself. Right now you're on a vacation and so you must replace 'educate' by 'enjoy'!" - Frisk pointed out - "After all, this is what Mom and Dad want you to do now."
"I guess you're right, Frisk..." - Asriel lowered his book - "But the truth is, I'm just not completely at ease, walking around among people."
"That's what I thought. But don't worry, here on the beach, people won't direct all their attention to you." - Frisk reassured him - "So, it shouldn't be as uncomfortable as in the city, for example. It's the best place to start getting used to them."
"Probably, yeah..." - Asriel then stood up and stepped in the sunlight - "Since I'm wearing boy clothes now, there won't be any awkward moments when they'll confound me with Mom."
It was true that sometimes, when Asriel happened to go to the city, people would walk up to him thinking that he was Toriel. They'd always quickly realize the mistake, but it didn't make it less awkward. But here and now, Asriel could enjoy calm moments outside. And so, the young prince walked closer to the sea and smiled contently when he felt the cool water touch his feet. He stood there for a long moment, until Sam and Piper decided to prank him by splashing him in the face. Asriel yelped and then narrowed his eyes at the giggling kids.
"Oh you little rascals! Just wait until I catch you!"
"I wanna see you try!" - Sam replied with a playful provocation.
And so, Asriel started to chase the twins long the beach, while Frisk, Noelle and Papyrus laughed at the scene. He almost caught them but, not used to run on dry sand, Asriel tripped and landed on his stomach. Concerned, the kids walked up to him.
"Are you okay?" - Sam asked.
"You didn't hurt yourself, did you?" - Piper asked on her turn.
Asriel recovered quickly from his unpleasant fall and so he used the opportunity to grab the kids.
"Gotcha!" - he shouted as the kids yelped - "So, did I win or I didn't? Didn't I tell I'll catch you?"
"Yes, yes, you win Asriel!" - Piper answered in between giggles.
Satisfied, Asriel put the kids down, allowing them to rest after running in the sun. Frisk quickly handed the kids some cool drinks, which they gladly accepted. Asriel smiled, feeling very alive at that moment. After living as an evil flower, he was grateful to have a caring sister, cute little nephew and niece, and of course Noelle, a niece and friend he owed his new life to. As he pondered on his luck, with the corner of his eye, he noticed a figure, standing a bit further away. With a gasp, he turned around, only to see that the figure was gone. Asriel felt uncomfortable - the figure seemed familiar. He could just see brown hair and a bit of green, but it was enough to remind him of… "No, this is silly. She's gone for years now. It was just my imagination." - Asriel thought. And so, the figure was quickly forgotten.

Days passed and soon arrived the day when Sam and Piper would return from their vacation. Gaster returned home from his walk and glanced at the clock. The kids would arrive in around thirty minutes, according to a recent message he got from Noelle. Gaster smiled to himself briefly, thinking about how the twins would enthousiastically tell him about their week at the sea. But quickly enough, the skeleton tensed. He got a strange feeling as though he wasn't alone in the house. There was like a dangerous, threatening even, presence.
"Whoever you are, I know you're here." - Gaster spoke up, his eyesockets glowing yellow - "Show yourself!"
"Now, now, it's not a very friendly greeting, is it Gaster?" - Chara replied as she showed up.
Gaster looked at the woman in front of him. With a frown, he asked firmly:
"Who are you? And what are you doing in my house?"
"Aw, don't tell me you don't recognize me? I can't blame you, I suppose. It's been dacades now! Or maybe you just forgot my name? Considering you never called me anything but 'human'."
"C-Chara...?" - Gaster eyes widened at the realization - "But it's impossible, you-"
"Died? Well, surprise! I'm alive again!" - Chara replied, imitating a joyful voice - "I guess there's no point in asking you if you missed me, Doctor Gaster."
The emphasis on the word "doctor" was of course a reminder of how Gaster forced her to call him back when she was still a child. Gaster ignored this, as he still tried to process, shocked by Chara's sudden return.
"No, no, it... it just can't be... It's impossible!"
"Really? You are telling me what's possible or not? Seriously, considering what you've accomplished so far, you're no longer allowed to claim that my return's impossible." - Chara replied, then grinned - "Speaking of that, I owe a thank you. Because indirectly, it's thanks to you that I could come back. Thanks to your 'De-Code'… I could cross the fabric of space and time."
"So you're from a parallel timeline..." - Gaster understood - "And I weakened the space-time fabric… Oh my goodness…"
"Yes, I come from a neighbour timeline: very similar, yet different in its ending." - Chara replied with a grin - "All it took for me to come back was Frisk to rise her LV! The rest came out naturally."
"What..? Are you telling me that Frisk's LV brought you back from the dead?" - Gaster asked, then shook his head - "It's impossible. Frisk is one to hug and pet monsters instead of killing them."
"So, you've called me 'human' for years, and you call Frisk by her given name… just great." - Chara muttered with a hint of irritation, but quickly put back a smile on her face - "You know what timelines imply. You also know what a person would do out of primal fear. It can make you do things you never thought you were capable of. Frisk's no exception. But enough about this, those are just boring details."
"And why are you here, exactly?" - Gaster asked, raising an eyebrow.
"Well, you see, I have big plans. It includes revenge and mass destruction. And… I figured out that before starting what I'm planning, I must get rid of the only person that represents a real threat to me."
"And that would be me..." - Gaster guessed.
"Exactly." - Chara confirmed, her look getting darker - "This world has so many possibilities, there are many people I want to make suffer. I've been betrayed by the world, you surely know that feeling? I can't bear the thought that they all will live their life, while I'm..."
Chara paused for a moment. It seemed like her mind had drifted, but it was just for a second. She then smiled again and pursued:
"I've already reached the absolute, by erasing the entire world. But with what this new timeline has to offer, I can do more. And I won't stop as long as my thirst isn't satisfied."
Gaster couldn't believe what he just heard. He surely never trusted the human, but never he'd have thought she'd be so blood lusty. That she'd erase the world, kill her own family. In Gaster's opinion, from what he was seeing and hearing, Chara reached the bottom of insanity. As his facial expression was turning into one of anger, Chara commented:
"However, a genius like yourself can quickly figure out how to get rid of me, which is a big problem. I came here to solve it."
"You should know that I'm not one you can strike down easily!" - Gaster's eyes glowed yellow dangerously - "I will not allow you to do whatever you're planning, and I guarantee you it will hurt."
"Ooh, you're willing to fight?" - Chara took out her knife - "You really have changed since the War!"
Chara charged at him, but Gaster sent several bones in her direction and dodged her attack. He didn't waste time to turn her SOUL blue and fire at her again with his bone attacks. Chara grinned maniacally at him and her eyes flashed red for a short moment.
"Well, I guess it is a fight then. But are you strong enough to eliminate me?" - she asked with a laughter.
"Let's try and find out." - Gaster replied with a dangerous tone.
And so, a fight began. A rather violent one. Chara was a good dodger, but luckily not an expert. Gaster, on the other hand, was lucky to be very strong at magic and could avoid to be striked by the knife. At some point, he even managed to make Chara drop her knife, which slid under the couch. That way, Gaster was less exposed to danger. But Chara was a very determined person, and thus still strong. The window got eventually smashed in the battle and so it continued in the garden. Gaster was giving everything he had. He wouldn't let Chara kill him, because if she did, she'd kill all those he cared for!
"You're stronger than I thought you'd be, you know!" - Chara commented, with the intent of provocation - "But not as strong as I am!"
"Funny, I was about to say the same about you!" - Gaster growled in response.
With his bone attacks and blasters, Gaster managed to make Chara retrieve back in the living room. He followed and then managed to block Chara against a wall with several bones. The skeleton couldn't help but glance at the clock and his eyes glowed purple for a brief moment. It was brief, but it was enough time for Chara to notice. The woman grinned at him and started to taunt him.
"Is that fear I see on your face? Let me guess, you're thinking 'Oh no, my children will be home soon, I must finish that nasty human off before they arrive and she kills them!'" - Chara imitated an exaggerately dramatic worried voice, then she added evilly - "Your fears are justified."
"Don't you dare..." - Gaster growled, not without panting.
He summon a blaster, ready to fire at Chara. Gaster knew now that violence wasn't the best solution, but now it was about to save his children and all the others from a murderous maniac. Chara could read Gaster's thoughts easily and she broke into a hysterical laughter. He thought he could get rid of her? No way! What he didn't know was the power she got from the world's destruction. A power she got from its very heart. Smashing it in pieces permitted her to absorb some of its magic. Now she could "cheat" whenever she pleased. Just as the blaster was about to fire at her, Chara glitched out from the skeleton's eyesight.
"What the-"
Chara appeared just in front of him in less than a second to grab the skeleton by the collar of his white coat and throw him against the wooden cabinet. The collision made the cabinet fall over Gaster and one of the items hit his skull hard. After a cracking sound was heard, Gaster was completely unconscious. Chara walked up to him and poked at him to see that there was no reaction. "He'll surely turn to dust very soon." - she thought with satisfaction - "I would've stayed to see it, but if his kids see me here now, my plans collapse." Chara then found her knife that she dropped earlier and fled away by the smashed window. In was a few moments later that Sam and Piper returned home. They gasped in shock when they saw the state in which the living room was, and they grew even more alarmed when they saw their father lying unconscious on the floor under the cabinet.
"Dad! Oh my goodness!" - Piper exclaimed.
"Oh no, no... We must help him!" - Sam rushed to his side and proceeded to lift the cabinet.
Piper quickly went to help her brother and quicly enough, they managed to pull Gaster from under the collapsed wooden cabinet. They saw that he was badly injured, there was a severe crack on his skull.
"What do we do...?! C-call the ambulance!" - Piper suggested as she started to shake.
Sam found Gaster's cellphone in his labcoat and, with trembling hands, managed to call the hospital. As he was explaining the situation the best he could, Piper was trying to shake Gaster awake.
"Dad... Dad, open your eyes... Do you hear me..? It'll be okay..! Please… Please don't die, Dad..!" - Piper's eyes got filled with tears - "Please live..! I... We don't want to lose you..! We can't!"
But Gaster didn't hear his daughter's pleas. The few minutes the twins had to wait until help arrived were probably the longest of their lives. And the question of who did this to their dad couldn't leave their minds.

A huge pain in his skull was the first thing Gaster felt when he slowly opened his eyes. When Gaster looked around, he saw that he was in what looked like a hospital room. A thin tube was going from under his shirt, that was connected to a pouch of a green glowing liquid. It was obviously a healing injection, being injected directly into his SOUL. The next thing Gaster saw was that very worried Asgore and Toriel were sitting at his side.
"Oh thank goodness, you're awake Gaster..!" - Toriel exclaimed, then put her hand over his shoulder.
"Toriel..?" - Gaster asked, giving her a confused look.
"Yes, that's me and don't worry. Everything's going to be okay." - the queen of monsters said with a gentle and soothing voice.
"You had a nasty crack on your skull when we found you, we feared it was too late." - Asgore said on his turn.
"Nghh... so that's why it hurts so badly..." - Gaster said as he carefully brought his hand to his head.
"The doctors will give you painkillers soon." - Toriel reassured him.
"...Good..." - Gaster breathed out as he stared at the ceiling - "W-what happened exactly..?"
"We thought you'd be able to tell us. You were found in a critical state before you were taken to the hospital." - Asgore answered - "It looks like somebody attacked you. Can you tell who it was?"
Gaster just groaned in response and shut his eyes close, obviously in pain. Toriel turned to her husband and suggested:
"Maybe we shouldn't ask him questions now. Let's give him time to recover and process; he's in pain and the shock must've been hard."
"You're right, Tori. This can wait a little."
"You... you shouldn't be here with me, though..." - Gaster then said quietly.
"But of course, we should. We're like a family, remember?" - Asgore protested - "Speaking of family, the twins will be so relieved to know you're awake. They were worried sick and they've been crying a lot. They feared you'd die. Shall I call Sam and Piper here, Gaster?"
A short moment of silence followed. Gaster looked at Asgore with a very confused expression.
"...Who?"

A/N: After six months of peace, megalo strikes back. Chara's here to stay and as you can see, she's very dangerous. And you'll have many occasions to see how cruel and sadistic she is.
I know, Chara exposing her intentions to Gaster before attacking him is an old cliché, but... in this case it can be justified by the fact that she's been living in the destroyed world all alone for decades, with nobody to talk to but perhaps herself. That's why Chara's quite a babbler.
Considering the chronology, Chara normally should be two decades older than Frisk and Asriel. But it happens that when Gaster de-coded the world prior arc 1, it had as effect that the other timelines were sort of put on "pause".
And how will Gaster react to his children, now that he lost his memory? Only time will tell.

(Oh, and that contraceptive joke... It works better in French actually, but I just couldn't resist! XD)