Chapter 1: Wha...
"We interrupt this program for some breaking news.
A rogue monster that seems otherworldly, not even originating from the Underground, terrorized the town.
It appeared in the city at about 12:00, and screamed, 'tElItUbBiEs!' as loud as it could. That same night, a monster and human went missing. Stay in your homes, people. There's an alien afoot. Now to the weather..."
That was all Frisk and Sans watched before they stared at each other.
"frisk?"
"Yeah?"
"remember last night when monster kid went into the city on a vacation with his mother?"
"Yes..."
"well... isn't he supposed to be back by now?"
"...Uh-oh..."
"and where's chara?"
"DOUBLE uh-oh..."
"hope that weird thing didn't catch them..."
Toriel strolled into the room. "Sans, Frisk- I need you to go shopping for clothes with Papyrus, Undyne, and Alphys. They should be there now."
"ok, toriel. we'll be back soon," Sans responded, teleporting Frisk to the city.
At the store, they bought clothes and started to head home before Papyrus noticed something in the alleyway.
"SANS, WHAT'S THAT THING IN THE ALLEY?"
"it's probably a raccoon," said Sans.
"I-I'M SCARED! I'M GOING TO GO CHECK IN THERE."
"Don't worry, we'll come check with you," said Undyne. "Just don't be a wimp..."
"U-uh, that thing Papyrus saw... D-did you guys see the news this morning?" asked Alphys.
"Yeah, that weird alien thing. It's probably fake, and all a joke," Undyne replied.
Everyone walked into the alley and met a red Teletubbie that was jumping into a portal.
"Quick, follow her!"Undyne yelled, and ran into the portal.
"I d-don't think this is a good idea, but we have t-to follow her, r-right?" Alphys exclaimed.
"yeah, let's go. SOMEONE'S gotta keep her outta trouble," said Sans.
"I'M SCARED!" said Papyrus.
"Me too," responded Frisk, and they all jumped into the portal.