do you wanna have a bad time?
cause if you take another step forward...
you are REALLY not going to like what happens next.
Sans before his boss fight
"Radiation's Halloween Hack" was about an alternate universe of EarthBound where the chosen four never returned, or simply put "bad rom hack with swears." According to "The Making of Radiation's Halloween Hack," the track Megalomanía from Live A Live was originally planned to be used as the game's final boss theme instead. Toby Fox never got around to it, so he "yelled whatever [he] felt like into a microphone and copied it down," thus creating "Megalovania." Toby Fox has also hinted that Megalovania was also inspired by the SFC/SNES version of "Gadobadorrer" from Brandish 2: The Planet Buster, where the hack's protagonist originated from.
This song would later be reused for the webcomic Homestuck, as MeGaLoVania on the Homestuck Vol. 6: Heir Transparent album with guitars from Joren "Tensei" de Bruin. This version makes a brief appearance in the Trickster Mode of "[S] Past Karkat: Wake up." and then makes a full appearance in "[S] Wake." This track's leitmotif can also be heard in other Homestuck songs. A few of the songs in the AlterniaBound album, such as The Blind Prophet by Toby Fox, She's a Sp8der, and FIDUSPAWN, GO! all contain the leitmotif. A song in a later album, Ascend, also contains the leitmotif.
After its appearance in Undertale, a remix of the Undertale version appeared in Super Smash Bros. Ultimate as paid DLC with the Sans Outfit for $0.75 released on September 4, 2019. This version also briefly features the leitmotifs of Heartache and Bonetrousle. It also appeared in Taiko no Tatsujin: Drum 'n' Fun! for the Nintendo Switch in the Undertale DLC Pack.
- The word "Megalovania" is a combination of "Megalomania" and "Transylvania".
- "Megalomania" is the boss theme from the game Live A Live, which served as an inspiration for "Megalovania." Though Megalovania doesn't directly quote Megalomania’s melody, it has a similar feeling and structure. In real life, megalomania is the delusion of being vastly more important and powerful than one really is.
- The word Transylvania was jammed into the name to give it a feeling reminiscent of Halloween.
- Toby Fox's mother calls MEGALOVANIA 'MEGALAVEGALA'.
- According to an interview with Toby Fox, this was one of the six songs originally composed for other projects. The other five were Fallen Down, Heartache, Nyeh Heh Heh!, Bonetrousle, and Another Medium.
- Toby Fox has composed a 'sequel' to Megalovania dubbed Megalo Strike Back which was composed for the I Miss You - EarthBound 2012 album.
- Toby Fox has stated that Megalovania - Clash with a Doctor, the version found in the MOTHER fangame "Cognitive Dissonance" (CogDis), was not made by him on his Twitter account.
- The original version of Megalovania was in the key of A in a minor blues scale, whereas the version found in Undertale is a pitched up, slightly faster and modified version in the key of D minor.
- It is the first Super Smash Bros. song to be released with a Mii Fighter.
- "Okay, finally finished. After wayyy over 140 hours (I spent hours every day since 9-12, yeah some days I didn’t do stuff but some days I was up until 12 since after school) I have finished my hack. Eeeeek." - Toby Fox. November 1, 2008. Starmen.Net.
- "This is the censored version of my hack. Technically they are exactly the same except for some swears near the end, but if you don't mind or are judging, I highly suggest you play the version provided at the following URL: http://forum.starmen.net/forum_attachments/0007/0301/radiationhalloweenhack.zip Otherwise, this hack is NOT appropriate for you." - Toby Fox. November 6, 2008. Starmen.Net. Halloween Funfest 2008.
- "Today is Halloween, so it’s a good time to post some Halloweeny stuff! So my obvious choice was Radiation’s Halloween hack of EarthBound from last year." - Mato. October 31, 2009. EarthBound Central.
- "I guess I should just accept "bad rom hack with swears" as part of my eternal legacy" - Toby Fox. February 9, 2016.
- "This is it, the final boss theme. I wanted to put Live A Live's Megalomania in here but I didn't get to so I made my own last boss song. I pretty much just yelled whatever I felt like into a mike and copied it down. Yep. Took forever, but it was superkickass-worth-it. Total embodiment of final bossitude." - Toby Fox. The Making of Radiation's Halloween Hack.
- "also, the last boss music was a little inspired by brandish 2's, see if you can catch the similarities" - Toby Fox on the making of Radiation's Halloween Hack.
- "Namewise yes, it is a direct reference to Megalomania from Live A Live. I've seen a few people pick up on that because that's cool. The chords are kind of similar but I wouldn't say it's a huge inspiration for the COMPOSITION of the song itself but it's TOTALLY attempting to be the kind of a badass song that might be suitable for a similar purpose. A little more in-depth: I originally made it for that Halloween EarthBound hack forever ago (and by forever ago I mean "back in high school") and people were ripping the song themselves from the game. I felt like maybe I should do a semi-official release ripped straight from the music editor program (the song actually lags in-game). I realized the song didn't have a name, so I took the inspiration for the track and the whole idea of the final battle (Megalomania) and just slammed some Halloweeniness into it (transylVANIA) and boom Megalovania."- Toby Fox. January 7, 2011. MSPA Forums.
- "mom: "So the song that everyone likes... Megalavegala or whatever?"" - Toby Fox. October 22, 2015. Twitter
- "There’s an arrangement of a song from a previous project here, as well. People are well aware of this one." - Toby Fox. October 10, 2015. Existential Gamer.
- "the version of megalovania in cognitive dissonance is not by me it's a fansong (?) by this guy:" - Toby Fox. September 22, 2015.