Toby Fox (formerly known as Radiation online) is a friend of Stephen's, who he met through

Toby has appeared in various vlogs, including Day 248Day 1599, and Day 2062.

He is the creator of Earthbound: Halloween Hack and Undertale, for which Stephen has made an episode of First20. He has also arranged music for Homestuck, Super Smash Bros. Ultimate, and Pokémon Sword and Shield, among others.

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