The "Boss Battle Fusion Collab", initially titled "??? Fusion Collab" before being renamed, is a high quality collaborative medley arrangement of various boss battle themes. It was initially premiered in the stream "Join us for the reveal of a mystery Fusion Collab!".


This collab has a unique structure from SiIvaGunner's previous fusion collabs; instead of being centered around a single song, each segment aside from the "Megalovania" opening is an arrangement of a boss battle theme (or the song associated with the boss in the case of Wood Man, or an equivalent thereof in the case of LazyTown and Yellow Submarine) from the game(/show/movie) of the previous segment's style.

Time Song Source


Boss Represented
0:00 Megalovania Undertale Undertale Sans
0:15 Megalovania Undertale Thunder Force IV Sans
0:31 Evil Destroyer Thunder Force IV Hyper Princess Pitch Gargoyle Diver
0:47 Boss Theme Hyper Princess Pitch We Are Number One Mecha Santa
1:01 We Are Number One LazyTown EarthBound Robbie Rotten
1:15 Pokey Means Business! EarthBound Puyo Puyo Fever Pokey Minch
1:36 The Untrained Demon King Ultimate Legend Puyo Puyo Fever Kirby: Squeak Squad Popoi
1:58 King Dedede's Theme Kirby: Squeak Squad Plants vs. Zombies King Dedede
2:18 Brainiac Maniac Plants vs. Zombies Yellow Submarine Dr. Zomboss
2:40 Hey Bulldog Yellow Submarine Crypt of the NecroDancer The Bulldog
3:14 Last Dance Crypt of the NecroDancer mm2wood The Necrodancer
3:27 Wood Man Stage Mega Man 2 Sonic the Hedgehog 3 & Knuckles Wood Man
3:49 Final Boss Sonic the Hedgehog 3 & Knuckles Splatoon 2: Octo Expansion Dr. Robotnik
4:02 Fly Octo Fly ~ Ebb & Flow Splatoon 2: Octo Expansion Paper Mario: The Thousand-Year Door Commander Tartar/NILS Statue
4:29 Hooktail Battle Paper Mario: The Thousand-Year Door Deltarune Hooktail
4:56 Chaos King Deltarune Super Smash Bros. King
5:25 Final Destination Super Smash Bros. Cuphead "The Mastermind's Hand"
5:53 One Hell of a Time Cuphead Undertale The Devil

At 6:08, the "One Hell of a Time" arrangement is abruptly cut off by the transition used for King for Another Day Tournament reveals. We then see the various visuals for the fusion collab's segments drift by, set to a calm, jazzy medley of the various themes based on "It's Raining Somewhere Else" from Undertale, ending with a "Boss Battle Fusion Collab" title in the Undertale logo's typeface.

After the screen fades to black, we suddenly get a "reveal" for Sans as a contestant in the King for Another Day Tournament. However, the logo's text turns into:

lol nahhh cmon dude
sans literally already said
he didnt want to be in the

This text references the reveal trailer "Knock Knock Knock!".

Instead of "SUMMER 2019", the text changes to "GET DUNKED ON", accompanied by Sans' soundbite.

Description Edit

Audio: Ahmaykmewsik, Anonite, Aquacycle, Chango, ChickenSuitGuy, Ethan64Music, Grambam36, Half Pixel, Netyasha Roozi, LarryInc64, Mitchell, Moder112, Sarvéproductions, Scribblenaut19, Spingus, WaluigiTime64, Zoom Guy

Visuals: 600billionlazer, 813N, adumb, Ahmaykmewsik, Alexander A. McDonald
Anonite, Aquacycle, ChickenSuitGuy, Coach, Count Cannoli, Eevee, Netyasha Roozi, Jorge - Sun Spirit, LarryInc64, Mitchell, Moder112, Sarvéproductions, Spingus, Tocinin, vince94

Video: Ahmaykmewsik
Thumbnail Art: Keeby, Sparkbag

Please read the channel description.

Trivia Edit

References Edit

  1. Wayback Machine
SiIvaGunner's Original Fusion Collabs
SiIvaGunner Top 10
Meme icon 1. Athletic Theme (PAL Version) - Super Mario World (3,936k views) Meme icon

2. We Are Number One - LazyTown: The Video Game (2,592k views)
3. Title Theme & Ending - 7 GRAND DAD (2,214k views)
4. Creative Exercise - Mario Paint (2,113k views)
5. DK Rap (Unused Version) - Donkey Kong 64 (2,063k views)
6. Unknown from M.E. (OST Version) - Sonic Adventure (1,757k views)
7. Nintendo GameCube Startup - Console/BIOS Music (1,747k views)
8. Game Over - Super Mario World (1,687k views)
9. Good Night - Undertale (1,671k views)
10. Windy Hill - Zone 1 (Beta Mix) - Sonic Lost World (1,662k views)

Runners up (over 1 million views)
11. Snow halation - Love Live! (1,472k views)
12. Dedede Fusion Collab (1,426k views)
13. Pause Screen - Wario World (1,400k views)
14. Dire, Dire Docks (OST Version) - Super Mario 64 (1,315k views)
15. Trailer Theme (Radio Version) - Sonic Mania (1,299k views)
16. Bob-Omb Battlefield (E3 Trailer) - Super Mario 64 (1,290k views)
17. DK Rap (Gorilla Version) - Donkey Kong 64 (1,251k views)
18. Trailer Theme (In-Game Mix) - Sonic Mania (1,237k views)
19. Your Best Nightmare (Alternative Mix) - Undertale (1,225k views)
20. Star Road - Super Mario World (1,158k views)
21. Boss Battle Fusion Collab (1,147k views)
22. Ultimate Koopa - Super Mario 64 (1,062k views)
23. File Select Fusion (1,020k views)
24. Jotaro Kujo Battle - JoJo's Bizarre Adventure: Eyes of Heaven (1,012k views)
25. Main Theme - The Loud House: The Game (1,008 views)

Season 2 Top 3
8. Game Over - Super Mario World (1,687k views)
16. Bob-Omb Battlefield (E3 Trailer) - Super Mario 64 (1,290k views)
26. Hammer Bros. Theme (OST Version) - Super Mario Bros. 3 (971k views)
Season 3 Top 3
27. Ta-Ta-Tax Fraud! (Reprise) - Yoshi Commits Tax Fraud (965k views)
41. Final Boss - iCarly (DS) (733k views)
53. Main Theme - VRChat (639k views)
Season 4 Top 3
21. Boss Battle Fusion Collab (1,147k views)
50. Last Surprise - Super Smash Bros. UItimate (657k views)
69. Game Over - Sonic the Hedgehog (534k views)
Season 4 Episode 2 Top 3
129. Gang-Plank Galleon (Unused Version) - Super Smash Bros. UItimate (326k views)
139. MEGALOVANIA (Unused Mix) - Super Smash Bros. UItimate (301k views)
—. Quick Escape - Metroid (218k views)

GiIvaSunner Top 10
1. Slider - Super Mario 64 (218k views)
2. Megalovania (Beta Mix) - Undertale (108k views)
3. Gerudo Valley - The Legend of Zelda: Ocarina of Time (94k views)
4. Staff Credits - Kirby's Epic Yarn (89k views)
5. Title Theme - Paper Mario: Color Splash (89k views)
6. Live and Learn - Sonic Adventure 2 (75k views)
7. Remix 10 - Rhythm Heaven Fever (72k views)
8. Ai no Uta - Super Smash Bros. Brawl (67k views)
9. Yell Dead Cell - Metal Gear Solid 2: Sons of Liberty (65k views)
10. Kokiri Forest - The Legend of Zelda: Ocarina of Time (61k views)

Last updated August 7, 2020.
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