Electric goop

Electric goop, also known as green goo, is electrically-charged goop that appears in Super Mario Sunshine. Its color consists of a mixture of teal and yellow, and it has electricity visibly surging from it. This type of goop is found only in Sirena Beach. When Mario touches it, he is electrocuted, dealing damage and briefly stunning him. Touching it also causes Mario's colors to be inverted momentarily. Because of their thick soles, the Pianta cleaning staff members of Hotel Delfino are unharmed by the goop; Nokis sink into it much like Piantas and Toads do in regular goop. Like regular goop, it can be cleaned up by water shot by FLUDD or similar sources.

In Episode 1 of Sirena Beach (The Manta Storm), the Manta covers a large portion of the beach in electric goop, causing Hotel Delfino to become stuck underground (much like trees and other structures do into regular goop). The Manta spreads goop behind itself and its copies during the ensuing boss battle. After Mario defeats the Manta, all of the goop disappears and the hotel rises back out of the ground. Electric goop reappears in Episode 6 of Sirena Beach (Scrubbing Sirena Beach), where it is shaped like a smiling Boo and covers most of the beach in front of Hotel Delfino. Mario has to clean all of the goop off of the beach within three minutes to earn a Shine Sprite.

Unlike the similar burning goop, electric goop can deal damage to Mario even if he steps on a tiny speck of it on the ground, compared to burning goop requiring a slightly larger concentration.

Also, unlike both regular goop and burning goop, electric goop never spawns Swoopin’ Stus.