Undertale Wiki
For the character, see Sans.

i'm sans.
sans the skeleton.

Sans's introduction

sans. is the 15th track in the Undertale Soundtrack. It plays during Sans's introduction, in the rooms that contain his sentry stations, inside Grillby's, and in Napstablook's snail farm.


  • The track appears to predate Undertale's development, having shown up as background music for a Homestuck-related project as early as October 2012, as "muscles.mp3", explaining its filename in Undertale.
  • This track was used as background music for Undertale's Kickstarter video, along with some others.
  • If Papyrus is killed, Sans does not appear at any of his sentry stations. This track stops playing in Grillby's and does not play in Napstablook's snail farm.