Guard&ScienceSwap is an AU by GoldenDust66 where the Royal Guard and the Royal Scientists swap.


Sans, Papyrus, Undyne and Alphys

Sans, Papyrus, Undyne, and Alphys are basically replaced with their Inverted Fate selves, except being in their original roles.

Monster Kid

Monster Kid now strives to be a scientist.

The Dogs

The Dogs of the Royal Guard are actually the main focus of this AU. Differences include:

  • Greater Dog and Lesser Dog can both speak English, thanks to bark-to-speech translators.
  • Doggo can actually see things that stand still, thanks again to science.
  • Greater Dog doesn't have his armor.


Gaster is a deceased Royal Guardsman, who was KIAed.


Gerson was a Royal Scientist who has retired and now runs a shop in Waterfall.