W. D. Gaster is a character in Swaptale. He was the Royal Scientist before Alphys and the creator of the CORE.


When Sans tells Frisk that he knows a way to get them back to their timeline, it is heavily implied to have a connection to Gaster, as a transparent form of him appears behind Sans. He later appears in the Neutral timeline when he is mentioned by Alphys when she confronts Sans about what he did to cross timelines.

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