Gaster did not care about the CS-1 project, he just wanted the current Royal Scientist to give up and let him go back to things he actually wanted to work on. Tangentally, CS-1 was not supposed to have a mind, and Gaster was not supposed to start worrying for him. Experiment!Sans adopted by Dadster.

Doctor W. D. Gaster was the Royal Scientist of the Underground and admired by many - Sans included. When he gets a job offer to be a lab assistant he's thrilled! The main problem, however, is that his admiration and respect are heading a bit more towards crush territory, but, really, that was fine. It's not like he could ACTUALLY fall in love with Gaster...right? (GasterxSans)

Life in the Underground passes you by when you're cut off from everyone. The two brothers, Sans and Papyrus, are taken in by the Royal Scientist, Dr. W.D. Gaster. But the good doctor is not their father figure. This is not a happy, loving family.

The life story of W.D Gaster

The Walk Home was peaceful, but Gaster swore he heard a baby crying. What happens when he comes across a Monster Toddler and their infant sibling? He may not think he's father materiel, but others sure think so. Contains Child Abuse

After Sans makes a mad bid to resurrect his long-dead father, W.D. Gaster's recovered soul suddenly goes missing, only to reappear in the most unusual of places. Hilarity and weirdness ensues. A strange fic for strange tastes. Full list of warnings in first chapter.

This is something most do not know about elementals: they are bred for war. (Warning for violence and war. Grillby backstory based off the popular fan theory that he fought in the human war. Don't get confused, he's called Flame now because of how elementals are treated, he'll be Grillby later)

This is a Experimental Log in Gaster's POV about how Papyrus and Sans came into being. Dark. Based off of the Zarla Universe on DA.

Sans woke up. The lab had been destroyed, Gaster was gone, and Asgore had a new job to offer to him.

{Undertale (c) Toby Fox} Sans talks to Gaster, and tells him what's been going on since the barrier broke.(Rated T Read and Review} ONE-SHOT

Explore the tragic backstory of W.D Gaster as you read about his accomplishments, success, and downfall.

RP between myself & ImWishingforaStarRod. Ascribes to the Mystery Trio au. During the first test run of experiment #78, the electron carpet, something goes wrong. Fiddleford and Stanford as the unfortunate test subjects are reverted to 10-year-olds instead of swapping bodies.Full prompt inside.*Written before A Tale of Two Stans, names will remain unchanged Enjoy