The Electroplankton universe (エレクトロプランクトン, Electroplankton) is one of the many unique universes represented in Super Smash Bros. Brawl and Super Smash Bros. Ultimate. The universe consists of only a single title (excluding the DSiWare re-release, split up as the game's 10 stages for individual sale): a relatively obscure music creation software. In Brawl, its only representation is a stage, Hanenbow, and a few stickers. In Ultimate, the Hanenbow stage returns with a new music track and a spirit.
In Super Smash Bros. Brawl
In Super Smash Bros. Ultimate
A Hanenbow appears as a spirit.