3:48 Undertale OST - Gaster's Theme? 3:23 UNDERTALE - Gaster's theme [ 8th Anniversary ] 5:05 Glitchtale OST - Vantablack [Gaster's Theme] 1:37 Gaster's Theme (OST Version) - Undertale 0:35 Undertale - Gaster's Theme 4:43 Glitchtale Animosity OST - W. D. Gaster fight Betty 3:30 Undertale 2 OST Gaster's Theme + Darker, Darker, Yet Darker Extended mp4 3:20 Gaster's Theme + Dark Darker Yet Darker (Original Lyrics) 2:37 Altered Colors (Second Sanctuary Battle Theme) 1:03 Follow Me Into The Dark (Chapter 3 Credits Theme) 1:58 Overrouxled (Chapter 3 Rouxls Battle Theme) 4:25 Deltarune - Chapter 5: comic relief. (Sans Secret Boss Theme) [V2] 1:43 PAIN ITSELF (DELTARUNE Fantrack) 3:21 [Undertale] ENTRY NUMBER SEVENTEEN (W. D. Gaster battle theme) 2:10 Swing your Cane [DELTARUNE: Chapter Rewritten UST] 5:44 Playing All Secret Piano Songs Perfectly + Gaster's Theme – Deltarune Chapter 4 0:43 Gaster Theme from Undertale, if The Beatles made it 4:30 Entry Number 17 - Dark Darker Yet Darker 1:48 What If Gaster's Theme Was a Full Song? 4:46 Undertale - Gaster's Theme 【Intense Symphonic Metal Cover】 4:25 [Undertale Remix] SharaX - Dark Darker Yet Darker 3:43 [Undertale] Gaster's Theme Remix - W. D. Gaster's Megalovania (amella Remix) 0:24 Undertale OST – Gaster's Theme (Samsung Cover)