Frisk walked through waterfall, smiling as (s)he just met up with Shyren. They hums her tune as (s)he walked and stopped seeing a grey door. They think to themselves, not remembering the door. As they reach out for the handle, a boney hand grabs thier wrist.
"Hey kiddo, I wouldn't do that" said Sans, who let go of Frisk's wrist. "Come on, let's go to Grillbys, I'll explain everything there." He said and Frisk nodded, using a short cut. At Grillbys, as sans holds a bottle of ketchup, he sighs when Frisk asks what was behind the door.
"Listen Frisk... the royal scientist before Alphys was W.D Gaster, he made the core, you know, the big thing in the lava the powers the underground?" Sans asks and Frisk nodded understanding. "Well one day he fell into it and, well, there wasn't even dust of him to bury" As Sans said this Frisk gasped. "I'm not done yet" Sans said and took a deep breath "Since he didn't die, he was thrown into the void and scattered throughout space and time. Behind that door you saw is the voids entrance, if you open it there's a chance you might get sucked in too."
Frisk thought and asked how he fell about this and Sans sighed. "I'm not too sure how he did it, but there could be something in the true lab that could tell why". Frisk got a determined expression on their face told Sans they would look together. Sans chuckled, "alright kid, let's go." He said and the two appeared in the true lab. It was a part they had never seen before and they saw a door with huge locks on it.
"Frisk stay close to me at all times, I'm not sure what's around here." Sans said and Frisked nodded. The locks shined with a blue glow around them and they ripped off the door, letting it creep open. They walked into the room as Sans picked up a dusty folder from the ground, labeled Project J. "I don't remember anything called Project J..."
Sans opened the folder, reading its contents and his white pupils went to pin pricks for a few moments. Frisk asked what was wrong, looking at Sans worriedly. "I...heh, don't worry kiddo, j-just look around" he said assuring them, but from body language Frisk knew he was lying.
Frisk sighed and looked around the room, seeing a black tarp covering something. Curiously, they pulled it down. Sans heard Frisk yelp and rushed to them "Kid what was-" He stuttered. "What the hell..." Sans said in shock. What the black tarp was covering was a giant test tube. Inside it was a skeleton with a black jacket and pants, with what Sans recognized as shoes he had when he was still with gaster. Sans noticed the skeleton had a hole in his hand, 'Just like Dad...' He thought. Frisk looked at Sans and asked if the skeleton was dead.
"I don't know kid, let me check." Sans said, walking towards the test tubes control panel. "Ok let me check their hp-" Sans felt a cold feeling in his bones, looking at the skeletons stats. "O-ok " he said shakily, reading off the stats "His name is Jack, defense is 5 attack is 5... Wait, there's something else… It says in wing dings… My greatest achievement. " He said the last part shakily. Frisk looked at the skeleton and asked Sans if he could wake this "Jack" up.
"Ok, let's hope he's not bad like some of gasters other experiments." Sans said and pressed a button that was labeled "release". The water in the test drained, leaving the skeleton on the floor of the test tube as the glass slid up. Sans held frisk behind him, two white pupils were in the skeletons eye sockets, like Sans, and slowly looked at sans. Sans said waving at Jack "Heya"
