Papyrus is Gaster and doesn't know it
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Papyrus goes looking for his golden flower friend who seems to have been left behind in the Underground. On finding out that Flowey won't come with him without a soul he declares they'll just have to make Flowey a soul -- everything is possible if you really try, after all.
As Papyrus starts encountering lost memories he finds that might be truer than he knew.
- Part 1 of Papyrus W.D. Gaster