A.N. Decide to have this crossover story and this story is a sequel to my last story of Determined to Stand. Anyways I hope you will enjoy this story. I know there is one that has a Scooby Doo and Undertale and I enjoy that story. Yet I'm doing this my own way. With that being said I want to point some things out before we get started.

One is that there will be OCs involve in the story. Beware of that especially since this is a crossover.

Two is that Frisk is a female in this story and Chara is a male. Two complete opposite genders from the two.

Three and final thing there will be some contain spoilers for the game of Undertale. If you haven't played the game or watch someone play the game then don't read it!

Thanks and hope you enjoy this crossover story!

Driving into the city the van with three different color of pink flowers and a large yellow print says "Mystery Machine" on it.

Inside this van is two females one with long reddish orange hair wearing a purple shirt and a pink mini skirt and the other has short brown hair wearing black nerdy glasses and orange sweatshirt and brown mini skirt. Then there are two males one with the blonde hair wearing a white shirt and a red tie driving the van and the other male in the back seat has brown hair wearing a green T-shirt and sloppy brown pants. Also in the back seat is a brown dog with black polka dots on the dog wearing a blue collar with a yellow tag on it.

The female with the glasses said without looking up from her magazine she has about the city they are going into.

"Huh? It has lots of fairy tales of this city especially the one that they are super suspicious of more like fear of."

The girl with the purple shirt ask, "what do you mean by that, Velma?"

Velma pulls her glasses up saying, "there is a legend of a half human and half monster that long time ago use to live with the human and monsters."

The man with blonde hair glance at Velma while keeping his attention on the road, "monsters? Isn't there no such things as monsters?"

Velma nods, "there isn't at all Fred, it's just a legend."

The man with the green shirt and his dog began to shiver, "monsters?! Here in the city!"

The dog spoke, "ronsters! Oh no!"

The girl with the purple shirt turns to face them saying, "don't worry Scooby and Shaggy. There is no such thing as monsters, right Velma."

Velma nods, "that right Daphine there is no such thing."

Shaggy and Scooby both gave a huge sigh of relief.

Daphne looks at Fred and asks, "so why are we coming here?"

Fred shrugs "just because I kinda wanted to."

Velma looks at Fred and asks, "isn't this where your grandparents live?"

Fred nods, "that why I wanted to come here."

Daphne smiles, "oh I see that makes sense."

Fred smiles as he said directly to Shaggy and Scooby, "my grandma makes the best pumpkin pies ever."

Shaggy and Scooby both began to stick their tongues out happily to hear about that. Velma rolls her eyes as she glanced up at Fred.

"You had to say that to them."

Fred shrugs, "just saying."

Daphne and Velma look at each other knowing why Fred told Shaggy and Scooby about the pumpkin pie.

Fred stops by a gas station to get some gas. Once everyone got out Fred went to get the gas while Velma and Daphne went into the building to get something to drink.

Shaggy and Scooby were looking around till they spotted a hot dog stand not far from the grocery store which isn't far from the gas station. They both look at each as they both ran to the hot dog stand. Once they both got there they look around to see nobody around but a sign saying it's open.

Shaggy looks at Scooby and said, "I don't know where the owner of this hot dog stand is."

"Me rither."

Soon a deep voice said, "heya, sorry I'm late I had to help my niece for a moment."

Both look at the stand to see a skeleton wearing a blue jacket with a white T-shirt inside and black shorts with two white stripes on the side of the shorts standing behind the stand. He has white pupils inside his eyes sockets.

Shaggy and Scooby's eyes widened with fear as they both ran off fearing the skeleton.

The skeleton shrugs as he sits in his chair and put his feet up on the stand showing his two pink fluffy slippers.

"Guess there are some humans still don't trust us monsters anymore."

As Fred came back from paying the gas and the girls got their drinks they happen to see Scooby and Shaggy running right into the van screaming.

Fred and the girls look in the van to see Shaggy and Scooby hugging each other shaking really badly.

Daphne ask in worry, "guys what happen?"

Shaggy and Scooby looks at the gang to see their worries. Shaggy got up and told them that he and Scooby met a real skeleton at the hot dog stand. Of course when he finishes explaining the gang did not believe him.

Fred spoke, "well we better get going. And guys there isn't any such things as monsters. Besides the guy was probably dress up for some reason."

Velma shrugs "he's really early for Halloween."

The gang got into the van and drove away from the gas station.

Meanwhile…

As the skeleton fell asleep on the hot dog stand with some people looking at him oddly before going on their day. Just then the phone rang making the skeleton wake up as he almost fell out of his chair. He looks at his phone to see his brother's name on it. The skeleton answer the phone.

"Hello, this is fart master speaking."

"Sans, that wasn't funny and I hope you weren't sleeping on your job."

Sans looks at the hot dog stand and said, "maybe."

"Sans! How many times I have to tell you not to do that!"

"Heh, you know me as the lazybones."

"You are such irresponsible."

"So uh… what did you want, Paps?"

Papyrus gave a loud sigh as he spoke once more, "I came to call you because I wanted to make sure that you knew that I might not be home tonight."

Sans looks at his phone with worry, "why?"

"Because Undyne wants me to be trained for being a better fighter them Mettaton and I'm going out to uh… spend the night."

Sans sigh, "you're sure you want to do this?"

"Of course I am Sans. Besides Mettaton isn't all that bad."

Sans nods, "alright I suppose so. Welp, see ya tomorrow then."

"I'll make sure to call you before I go to bed."

"Thanks, I would like that."

"I'll call you later and don't sleep on the job!"

Sans laughs, "no prob Paps, but you know I'm a such a lazybones."

Papyrus gave an irritated sigh before he hung up the phone. Sans laughs as he put his phone back into his pocket.

After ten minutes his phone began to ring Sans looks at his phone to see Frisk's name on it.

"Welp looks like the kid needs my help on her homework again."

He answers the phone and asks, "need help with a problem, kid?"

Frisk sighs as Sans could tell something is wrong, "kid, Frisk, are you alright?"

"Sans" Frisk spoke slowly, "I suppose I'll tell you later. Since you are probably busy with business."

"Nah, I ain't busy right now. You can tell me. I'm always listening here."

Frisk giggles a little, "it's just I been wondering about that innocent with Chara and Mr. G and I can't help it if they might come back."

Sans sighs as his white pupils disappear, "Frisk, listen you know me and Paps won't let nothing bad happen to you."

"I know but it's just…"

"Stop! You don't need to worry about anything anymore. Besides Kameron had promised us that he'll keep you and all of the races safe from Chara and Mr. G so stop worrying about this."

It was quiet for a while till Sans finally broke the silent.

"Look just forget about all that. I mean we are happy now we don't have to worry about that for a long time."

Frisk sighs as she whispers trying to not let Sans hear, "nobody would understand."

Sans heard her, "what are you saying kid?"

Frisk gasps, "you heard that?!"

"Couldn't help to hear it. I began to think there is more that you don't want to tell me. So what is it? No more secrets."

Frisk was silent for a moment before she spoke, "it's just I don't know how to explain it but I think I'm being treat or more like being stalk."

Sans sat up straight, "what do you mean?"

"It's nothing. Something you wouldn't be able to do."

"Frisk, you know I'll do anything to keep you safe. So tell me what's going on and who's stalking you?"

"I really don't know who but I know there is someone in my dreams and possibly in my head. She keeps on treating me to kill me and she wants to hurt all of you. She never really shows herself but I know by the tone of her voice she's a female."

Sans nods as he listens, "so this girl comes into your dreams? Is she like Chara?"

Frisk began to cry "I don't know! I never saw her or know who she is!"

"Wow, wow, kid calm down. I'm not upset at you. I want to help you too. We can figure this out together."

"Just like before?"

"Just like before kiddo, we can do it."

"Thanks, that means a lot to me. Besides, I never told mom about this."

"It's probably best Tori already has enough on her hand. Do you want me to come over to keep you company?"

"No, I know you're pretty busy."

"Nah, I can be there for you if you want."

Frisk sighs, "no, I'll be okay I'm just glad that you call me."

Frisk hung up as Sans looks at his phone for a while. Then he decides it would be best if he should go check on Frisk to make sure she's okay.

With that Sans close his hot dog stand and grab a couple of hot dogs before he teleported to Toriel's house to check on Frisk.