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SMB3 Jelectro.jpg
Artwork of a Jelectro from Super Mario Bros. 3.
First appearance Super Mario Bros. 3 (1988)
Latest appearance Super Mario Maker 2 (2019)
Subject origin Jellyfish
Jellyfish (Yoshi's Story)
Notable members

Jelectros are glowing, electric jellyfish enemies that slightly bob in place underwater in Super Mario Bros. 3. They are invincible to all attacks, even Invincible Mario and hammers.


Super Mario Bros. 3 / Super Mario Advance 4: Super Mario Bros. 3[edit]

SMAS SMB3 World 3-5 Screenshot.png

Jelectros appear in World 3-5 and World 7-4 of Super Mario Bros. 3. In World 3-5, they are spread throughout the level, while in World 7-4, a large swarm of them can be found in the middle of the autoscrolling level. Much like Munchers, they are damaging, animated scenery tiles, and thus act as an indestructible solid surface.

In the GBA version, Jelectros bob up and down in place, rather than staying completely still. They also appear in one World-e level: Sea to Sky.

The Adventures of Super Mario Bros. 3[edit]

Several Jelectros as they appear in The Adventures of Super Mario Bros. 3 episode "The Ugly Mermaid"

Jelectros also make appearances in The Adventures of Super Mario Bros. 3. Here they are similar to their game appearances, except they have glowing red eyes and a more squared shape. They appear in episodes such as "Reptiles in the Rose Garden", where they can actually move, and "The Ugly Mermaid", where they stand still like they originally do in Super Mario Bros. 3.

Super Mario Bros. Print World[edit]

Mario jumping out of water from Super Mario Bros. Print World

A Jelectro appears in the printing software, Super Mario Bros. Print World, in the artwork entitled "Swimming Mario" alongside Mario.

Super Mario Bros. & Friends: When I Grow Up[edit]

Mario as a marine biologist.

In the coloring book game, Super Mario Bros. & Friends: When I Grow Up, the coloring page for Marine Biologist has a Jelectro swimming with other underwater enemies and Frog Mario. The description for the job is as follows:

Mario the marine biologist has just discovered some new life forms living at the bottom of the sea: Cheep-Cheeps, Jelectros, Bloobers, and Trouters, to name a few.

Nintendo Adventure Book[edit]

In the Nintendo Adventure Book Leaping Lizards, Luigi spots some Jelectros through a window while exploring Iggy Koopa's secret underwater lab in Water Land. Three weeks later, some Jelectros appear in the swimming portion of the International Mushroom Games obstacle course. If the reader chooses Luigi to compete in the course, one of the Jelectros will shock and briefly stun him as soon as he enters the water.

Super Mario Maker / Super Mario Maker for Nintendo 3DS / Super Mario Maker 2[edit]

Jelectros appear as one of the course elements that can be placed in Super Mario Maker, Super Mario Maker for Nintendo 3DS, and Super Mario Maker 2. They replace the Spike Traps when creating a course in the Super Mario Bros. 3 underwater theme, keeping their properties from Super Mario Bros. 3. In Super Mario Maker, they are only identified as Spike Traps, but Super Mario Maker 2 calls them by their actual name.


Perfect Ban Mario Character Daijiten[edit]

種族 アクア族
性格 おしついている
登場ゲーム 3

Tribe: Aqua clan
Disposition: Calm
Game appearances: 3
The invincible jellyfish army!
An invincible electric jellyfish that cannot be harmed by any attack. They do not move at all, but they appear in such large numbers that it is very difficult just to get between them. If you wear a Frog Suit, you can swim easily.


Names in other languages[edit]

Language Name Meaning
Japanese しびれくらげ[2][3]
Shibire Kurage
Numbness Jellyfish
French Médusélectrique[4] Portmanteau of "électrique" (electric) and "méduse" (jellyfish)
German Quallektro Electro-Jellyfish
Italian Elettromedusa Electrical Jellyfish
Korean 찌릿해파리[5]
Jjirit Haepari
Shocking Jellyfish
Spanish Electromedusa Electric Jellyfish


  1. ^ Shogakukan. 1994.「パーフェクト版 マリオキャラクター大事典」 (Perfect Ban Mario Character Daijiten), page 89.
  2. ^ Super Mario Bros. 3 Japanese instruction booklet, page 37
  3. ^ Nintendo of Japan. "CHARACTERS of Super Mario Bros. 3". CHARACTERS of the Super Mario Bros. series (official Japanese character index). Published 2020. Accessed 01 Mar 2021.
  4. ^ Super Mario Bros. 3 French instruction booklet, page 42
  5. ^ Super Mario All-Stars Limited Edition Korean instruction booklet, page 30