Goten and Frisk left the room, closing the door behind them. The two decided to explore a bit, and have a good final look at Toriel's home.

Next to the children's room was another bedroom(which they assumed to be Toriel's), and like the other rooms, it had a color scheme. The room's color was blue this time.

Inside of the room, there was a dresser, a bed, a desk, and a tall lamp. About the same stuff as there was in the other room, minus the toys. On the desk, there was a diary(presumably Toriel's), opened up to a page, and a section had been circled in red. Frisk walked up to the desk to read the circled section.

"You know it's not polite read other's personal diaries." Goten scolded Frisk, who at the sight of the diary became a little green in the face.

"I feel like I'm going to throw up!" Frisk moaned.

"Frisk, are you okay?" Goten asked, moving over to Frisk's side. She shook her head, no, and pointed to Toriel's diary.

"Why did the skeleton want a friend? Because he was feeling BONELY..."

Goten, unable to bear the cheesiness of the joke, fell to the floor.

"Please kill me..." Goten moaned, also getting green in the face.

"Miss Toriel?" Goten said, letting her know that he and Frisk were there. Goten and Frisk had moved into the living room after throwing-up outside. Toriel was sitting in a sofa-couch, reading a book about snails.

"Yes, my child?" Toriel said, looking up from the book she was reading.

"I want to go home." Goten said.

"What,?B-But this IS your home!" Toriel gasped.

"Nah, you just kind of abducted us." Frisk said, bluntly.

At this, Toriel sighed. She took a deep breath, then looked at the two children.

"I'm sorry, I have to do something. Don't follow me." Toriel said, leaving the room and going down some stairs.

Goten and Frisk turned their attention to eachother. The stared for a while before Goten finally spoke up.

"I wonder what she's doing down there."

"Wanna go look?" Frisk asked.

"Yeah! Let's go!" Goten shouted.

The two followed Toriel down the stairs.

When they first entered, they were greeted by a dimly-lit hallway. Frisk wasn't too fond of the dark, but right now she could feel something within her keeping her strong.

"I can barely see a thing in here..!" Goten said. "It's going to be hard for us to get around."

Luckily for them, the hallway wasn't very long anyways. After a few turns, the two reached Toriel.

Toriel was preparing to destroy a door, but when she heard the footsteps behind her, she turned to face the two.

"You foolish children... Do you really want to go home that much? Is it so important that you'd risk you life for it?" Toriel asked, rhetorically, questioning the children's will to live.

"What?! Toriel, what are you talking about?" Goten asked.

Toriel couldn't believe this child's ignorance.

"Toriel, is that the exit? Why are you doing this?" Frisk asked her.

Toriel's reasons for destroying the Ruin's exit...

"You naive child... If you leave the ruins, they'll all... No, Asgore will kill you. I am just protecting you two." Toriel explained.

"What?! Is Asgore as strong as you?" Goten asked, a bit fearful.

"As strong... No... He is stronger." Toriel said, sending a chill down Goten's spine.

'S-Stronger than Toriel! I don't think I can...!' Goten thought, shaking. Frisk could see how intimidated Goten was by all of this.

"Goten, are you alright?" Frisk asked. This snapped Goten out of his panicking state, and he gulped down the fear he felt. He regained his natural composure.

"I-It... It doesn't matter!" Goten shouted, looking serious. "I need to go back home! My mom is probably worried sick about me!"

"If that is how you feel... Foolish boy... Then I shall test your strength!" Toriel shouted.

"What do you-?" Goten tried asking, but was cut-off when Toriel shot a fireball at him.

Goten dodged it with ease.

"Hey, lady! What do you think you're doing!" Goten yelled at Toriel.

"How rude." Toriel remarked.

"Goten! Goten, are you alright?!" Frisk asked him as she ran to his side.

"Yes, I'm fine.." Goten assured her. "Now. Toriel, I'm not going to fight you!"

"..What do you mean you aren't going to fight?" Toriel asked.

"You, yourself, taught us mercy. Toriel, I don't want to fight you." Goten explained.

"I don't want to fight you either! Toriel, you're like my 'other mother'." Frisk smiled. "I don't want to fight."

"Well, unfortunately for you, other monsters aren't going to be as lenient as me." Toriel scoffed, before shooting a barrage of fireballs at the two.

As the fireballs closed the gaps between their targets, one thing ran through Goten's mind.

"Frisk, run!"

With each incoming fireball, Frisk did the best she could to dodge them. She ended up getting hit by a few, ending in small explosions.

"Frisk!" Goten shouted, concerned for his friend. 'I'll be there in a second, just hold on!'

Goten attempted to deflected the balls by chopping them, which ended in them exploding on contact,

"Ow, ow, ow ow!" Goten seethed, holding his burnt hand. "I have to be more careful!"

He surrounded his hands in a thin energy barrier, protecting his hands from the explosions.

"Great! Now come at me!"

Goten was now able to deflect the fireballs by adding energy to them as he hit them. The energy controlled the direction the balls flew in, and also protected him from impact. He could now kick the fireballs away, allowing him to use his full ability.

"HAH..!" Goten shouted, shooting one of the fireballs with a ki blast. The fight had been going on for a while, and Frisk became better at dodging, so he figured he could get serious without having to worry about her.

It was a war zone between Goten and Toriel. Goten kept countering everything she fired at him, even when the attacks grew in size. Toriel eventually forgot about Frisk, and continued with an all-out barrage in Goten's direction.

Frisk walked over to Goten's side, believing the victory to be theirs.

"Aha!" Toriel shouted, ceasing fire.

"Did you... Do you accept defeat?" Goten asked, panting. He was exhausted.

"No, I'm just taking advantage of a great opportunity to take you both out." Toriel said, also exhausted. She snapped her fingers, and gigantic fireballs surrounded both Frisk and Goten.

"No...!" Goten seethed.

"Did we.. lose?" Frisk asked.

"No, but you are about to." Toriel smirked. "And you'll lose something else."

"Toriel, please don't-"

"Your lives." Toriel said, snapping her finger again, The fireballs moved in, quickly closing the distance.

'Oh no! We'll die if either one of us is hit with that!' Goten panicked.

"Goten..?" Frisk said, slowly becoming more and more scared.

'It's over! We're going to die!'

"Goten...!"

The fireballs were very close. There wasn't anymore time to think. He had to...!

"GOTEN...!"

"HAH!" Goten shouted, becoming wrapped in a golden aura. His hair rose and changed to a golden color. His eyes changed from black to teal. He became a Super Saiyan!

The power radiating off of his Super Saiyan form dispelled the incoming fireballs, while pushing Frisk into the air as well.

Goten's exhausted body couldn't handle his Super Saiyan state, and he ended up collapsing.

Frisk hit her head on a wall, and she passed out.

Toriel POV

That boy..! He had the power to disperse my attacks when he was so exhausted. Not only that, but that transformation of his..! He couldn't possibly be a monster, he looks too human! Yet, he can't be a human... What is he?!

I guess it's finally time I exit the ruins, just for a little bit. But I can't let anybody know that it's me... How will I take care of this predicament...

Oh! I have a mask around here somewhere! Let me just put that on!

This boy, he really is ready for the Underground. But that girl, I'm not to sure about her... But.. As long as are with eachother, I shouldn't have any fear. This kid will protect her well. After all. she is his friend.

3rd Person

Goten slowly began to stir, as did Frisk. The two woke up in a hotel-like room.

'This obviously isn't Toriel's house.' Goten thought, rubbing his eyelids.

"How long have we been out?" Goten asked no one.

"Goten? I had this weird dream." Frisk said, starting to wake up.

"Oh really, what was it like? I didn't dream at all."

"First, we met this goat-lady named Toriel. She led us to her home, and she tried to kill us."

"..That wasn't a dream. And that also wasn't exactly what happened." Goten told her.

"Oh! Also, there was this part where you're hair changed colors!" Frisk said, at which, Goten jumped.

"N-No, my hair is black! Hair can't just change colors!" Goten tried to convince her.

"..Yeah, you're right! It's just a dream anyways!" Frisk smiled.

"Yeah.. Ha ha..."

So Goten had to transform to survive. And Frisk seems not to remember anything since after their encounter with Flowey.

I have an extra(non-canon):

Goten and Frisk left Toriel's room, wishing for a lighter and gasoline. Just burning the diary isn't enough, the entire room is CONTAMINATED with that horrible joke. Burning the room would be the only way to save the world from it's... Wow, it's so bad that there's no word to describe it!

"I really need to go pee..!" Goten said, outloud,

"Um... Why don't you just ask Toriel where the bathroom is?" Frisk asked him.

"Oh yeah, I forgot about her!" Goten exclaimed.

He made his way into the living room where Toriel was reading her snail book.

"Miss Toriel, where's the bathroom?" Goten asked her.

"The what?" Toriel said, confused.

"You're kidding! The room where you toilet is!" Goten shouted.

"Toilet? Goten, please, I am trying to read! Now is not the time to be speaking gibberish!" Toriel scolded.

"Where do you go to poop and pee, Toriel!" Goten yelled.

"Oh, that. I usually just go outside!" Toriel smiled.

Goten and Frisk just stared at her, looks of disgust directed her way.

"What?" Frisk asked. "Did I just hear you right? You go outside?"

"Yup!" Toriel smiled, as if everything were fine with what she had just said.

"Do you not have plumbing? Where do you shower?" Goten asked.

"What's a shower?" Toriel asked, genuinely confused.

Goten transformed into his Super Saiyan state. He cupped his hands next to him, and bent his knees.

"Ka... Me...!" Goten chanted. Within his hands, a blue ball of energy formed and rapidly grew in size.

"Ha... Me...!"

"Goten, what is that?!" Frisk asked him, referring to his current state, and the ball forming between his palms.

"Wait, what are you doing!" Toriel panicked. She recognized energy when she saw it. "Please, I'm being serious! I've never heard these terms!"

"...HAAAA!" Goten shouted, thrusting his cupped hands forward, releasing the charged energy into a wave. It devoured Toriel, and destroyed most of her house.

"No...!" Toriel screamed.

"BAAAAA!" Toriel bleated. She bleated until none of her was left.

Once the energy dispersed, Goten reverted to his base form.

"Come on, Frisk! We're leaving the Ruins!" He shouted.

"Y-Yes!" Frisk said, afraid of angering Goten. She followed close behind him.

DISCLAIMER 1: I don't own Undertale(Toby Fox) or the Dragon Ball meta-series(Akira Toriyama[THE CREATOR], Funimation, Toei Animation, etc). This is just a fanfiction made by.. Well, a fan.

DISCLAIMER 2: I got the whole "Where's the bathroom" thing from a comic I saw on YouTube. It basically went the same way I described it, except nobody died or got violent.