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Gaster is a mentioned character in Horrortale, he was the original scientist before Alphys. Alphys got the job as a scientist after Gaster fell into the core and died. He was also forgotten forever. He appears as a character that can be talked about to sans in the teaser fangame. Sans gets shocked after Aliza mentions Gaster and he kills her.

More info can be seen here:

https://www.youtube.com/watch?v=FAvMHgWZYAQ