All the character/battle themes from the Undertale AU Underfell.
SKIP:
Flowey's Theme (Your Only Friend) - 00:05
Battle Theme (Monster Approaching) - 1:51
Napstablook's Theme (Jumpscare) - 3:48
Toriel's Theme (Cardiac Arrest) - 4:54
Sans's Theme (Edgy Sans Is Edgy) - 7:39
Greater Dog's Theme (K9) - 9:32
Papyrus's Theme (Dry Bontrousle) - 11:02
Mad Dummy's Pacifist/Neutral Theme (Glad Dummy) - 12:12
Mad Dummy's Genocide Theme (Glad Dummy Goes MAD!!!) - 15:03 (Removed for the sake of sparing you from watching a 15-second ad everytime before watching this video. View the song that was originally on this video here: ua-cam.com/video/VuzBWDiVhvI/v-deo.html)
Undyne's Neutral/Genocide Theme (Spear of Agony) - 17:35 (due to a glitch where part of this theme was removed when the Mad Dummy theme was removed, it doesn't start playing until 17:54)
Undyne's Pacifist Theme (Battle Against A True Villain) - 21:24
Temmie's Theme (Temmie Nation) - 24:06
Alphy's Theme (She's Playing God) - 25:32
Mettaton's Theme (Metal Smasher) - 27:00
Muffet's Theme (The Black Widower) - 28:54
Mettaton EX's Neutral/Genocide Theme (Destruction By Glamour) - 30:54
Mettaton NEO's Pacifist Theme (Destruction of "NEO") - 33:14
Sans's Pacifist Battle Theme (Megavillainia) - 33:44
Asgore's Theme (A Ruthless King) - 36:26
Alpha (Omega) Flowey's Genocide Theme (Finale) - 40:24
Asriel's Pacifist Theme (Hopes And Dreams/Angel of Life) - 42:20 (If you are wondering why Asriel is a Pacifist, and not a Genocide boss, look in the comments below as I posted an explaination there)
I did NOT make the music, sprites, or artwork in this video. I just edited it all together into a full video.
I am aware that different people have made different Underfell themes. I listened to them all and chose the best ones. I made sure none of the themes chosen for this video were dull, slowed-down remixes of their Undertale counterparts. This isn't Turtletale or Snailtale, this is Underfell and thus the remixes should be edgier, not slowed down.
CREDITS:
Music is credited in the video. However, I was a bit unclear when it came to crediting some of the works by the Underfell Official Soundtrack. I am talking about the popular Underfell game created by Team Spritedgy on Gamejolt. Any mention of a theme created by the Underfell Official Soundtrack goes to all their team's composers.
Here's a link to the game's Game Jolt, where you can find the soundtrack there: gamejolt.com/games/undertale-underfell/151411
Sprites:
Papryus, red Sans, Alphys, Napstablook, Toriel, Greater Dog, Mettaton, Mettaton EX, and Muffet sprites: schelebro.tumblr.com/post/132376203104/underfell-sprites-a-quick-little-project-for-an
Undyne The Undying sprite: fnafspritemaker.deviantart.com/art/Underfell-AU-Undyne-Sprite-V-2-619429263
Asgore sprite: unusacies.tumblr.com/post/133883809722/i-had-seen-the-underfell-tag-and-i-realy-like
Sans Colored sprite: underfell.wikia.com/wiki/File:Underfell_Sans_Sprite.png
Flowey Picture is from Ryno Productions's Underfell series: ua-cam.com/channels/_YWqRrNfbu4HrTCA1q6QOg.html
Temmie Picture is from a preview picture of Team Spritedgy's Underfell game: gamejolt.com/games/undertale-underfell/151411
Mettaton NEO Artwork: spider-bakesale.tumblr.com/post/131625542270/iemaki-so-i-uhdesigned-an-underfell-mettaton
Alpha Flowey Artwork: devichonee.tumblr.com/post/133783625160
Asriel Artwork: www.tumblr.com/search/underfell-asriel