3:48 Undertale OST - Gaster's Theme? 3:23 UNDERTALE - Gaster's theme [ 8th Anniversary ] 0:36 Undertale OST: Gaster's Theme 4:00 YOUR FAULT | DELTARUNE Chapter 6 UST (Snowgrave Gaster Final Boss Theme) [666/6] 4:25 [Undertale Remix] SharaX - Dark Darker Yet Darker 3:21 [Undertale] ENTRY NUMBER SEVENTEEN (W. D. Gaster battle theme) 2:28 Dark, Darker, Yet Darker (Remix of Gaster's Theme) 1:48 What If Gaster's Theme Was a Full Song? 0:35 Undertale - Gaster's Theme 1:31 pirate gaster's awesome mystery shanty 4:43 Glitchtale Animosity OST - W. D. Gaster fight Betty 4:59 The Man Who Got Hands - DELTARUNE UST (Fan-Made W.D. Gaster Boss Theme) 3:43 [Undertale] Gaster's Theme Remix - W. D. Gaster's Megalovania (amella Remix)