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Toby Fox
Biographical Information
Developer and Composer
Date of Birth
October 11, 1991
fwugradiation, Toby "Radiation" Fox
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Toby Fox is an American video game developer and composer, best known for his work on the hit video game Undertale as well as Deltarune. He has also done composing work for the video games Hiveswap, Little Town Hero, and Pokémon Sword and Shield.


Early Life[]

Fox was born October 11, 1991 and studied environmental science at Northeastern University.[1]


Fox began his composing career in 2009 when made some music tracks for the webcomic Homestuck, the most notable of which being MeGaLoVania, one of the earlier versions of Megalovania.

In 2015, Fox created the critically-acclaimed Undertale, along with artist Temmie Chang. Fox was the developer, programmer, composer, and primary sprite artist for the game. Fox chose to work on the game independently in order to avoid relying on others.[2] Undertale became a massive success shortly after launch, with 500,000 copies sold on Steam just three months after release.[3] In February of 2016, the game surpassed 1 million copies sold.[4]

On October 31, 2018, Fox tweeted out a link to the download page for the first chapter of his new game Deltarune, under the guise of a survey.[5] Fox was included in Forbes' 30 Under 30 list for his work on Undertale.[6]

Undertale's popularity lead to the supporting character Sans being added as a DLC mii fighter costume in Super Smash Bros. Ultimate.[7]


Title Role Year
Earthbound: The Halloween Hack[8] Developer 2008
Undertale Creator 2015
Hiveswap Composer 2017
Deltarune Creator 2018
Escaped Chasm Composer 2019
Little Town Hero Composer 2019
Pokémon Sword and Shield Composer 2019
Super Smash Bros. Ultimate Composer 2019


  1. Dines, Jennifer (2011-09-11). CHANGE AGENCY: 826 BOSTON, EGLESTON SQUARE’S INSPIRATION CENTER. LiteracyChange. Retrieved on 2020-06-05
  2. Turi, Tim (2015-10-15). GI Show – Yoshi's Woolly World, Star Wars: Battlefront, Undertale's Toby Fox. gameinformer. Retrieved on 2020-06-05
  3. Madhaven, Melody (January, 2020). How Indie Game Undertale Became A Top Selling Game On Steam In 2015. ReferralCandy. Retrieved on 2020-6-5
  4. Grubb, Jeff. Stardew Valley is one of the best-selling PC games of the year as it surpasses 1M copies sold. VentureBeat. Retrieved on 2020-6-5
  5. Frank, Allegra (2018-10-31). Undertale creator's new game is Deltarune, a mysterious surprise. Polygon. Retrieved on 2020-06-05
  6. Toby Fox. Forbes (2018). Retrieved on 2020-06-05
  7. Lee, Julia (2019-09-04). Sans from Undertale joins Smash Bros. Ultimate as a Mii Fighter costume. Polygon. Retrieved on 2020-06-05
  8. Kaharl, Jonathan (2017-08-13). Earthbound (The Halloween Hack). Hardcore Gaming 101. Retrieved on 2020-06-05