3:48 Undertale OST - Gaster's Theme? 5:05 Glitchtale OST - Vantablack [Gaster's Theme] 3:30 Undertale 2 OST Gaster's Theme + Darker, Darker, Yet Darker Extended mp4 1:48 What If Gaster's Theme Was a Full Song? 6:54 Glitchtale - Ascended (#4 Ascension) EXTENDED VERSION | by amella 3:33 Gaster's Theme - Extended Arrangement 2:12 GASTER'S ROOM | Undertale 10th Anniversary Fan Animation (serious version) 2:45 Gaster's Theme – UNDERTALE | Arrangement 0:35 Undertale - Gaster's Theme 3:23 UNDERTALE - Gaster's theme [ 8th Anniversary ] 2:11 WALTZ OF THE HANDSPOKEN - A Gaster Theme Take 4:43 Glitchtale Animosity OST - W. D. Gaster fight Betty 2:28 Dark, Darker, Yet Darker (Remix of Gaster's Theme) 3:21 [Undertale] ENTRY NUMBER SEVENTEEN (W. D. Gaster battle theme) 4:05 Undertale - Gaster's Theme Remix [Kamex]