3:48 Undertale OST - Gaster's Theme? 1:48 What If Gaster's Theme Was a Full Song? 3:21 [Undertale] ENTRY NUMBER SEVENTEEN (W. D. Gaster battle theme) 3:23 UNDERTALE - Gaster's theme [ 8th Anniversary ] 3:00 Underverse OST - Rekindle [XGaster's Theme] 3:43 [Undertale] Gaster's Theme Remix - W. D. Gaster's Megalovania (amella Remix) 2:28 Dark, Darker, Yet Darker (Remix of Gaster's Theme) 4:25 [Undertale Remix] SharaX - Dark Darker Yet Darker 0:35 Undertale - Gaster's Theme 4:30 Entry Number 17 - Dark Darker Yet Darker 1:37 Gaster's Theme (OST Version) - Undertale 4:43 Glitchtale Animosity OST - W. D. Gaster fight Betty 3:30 Undertale 2 OST Gaster's Theme + Darker, Darker, Yet Darker Extended mp4 5:05 Glitchtale OST - Vantablack [Gaster's Theme]