Board Thread:General Discussion/@comment-27524978-20160210030742/@comment-11139677-20160229202958

Gaster's voice track thingy is an edit of Muffet's voice

Therfore, Gaster MUST be a spider

By extension, Sans and Papyrus are skinless spiders, and all of the unknown people were his spider buddies.

(See how easy it is to replace missing information with pointless nonsense?)