— Mermaid Man, various episodes

Ernie,[1] better known by his superhero name Mermaid Man,[2] is a semi-retired superhero who lives in Bikini Bottom. He and his sidekick Barnacle Boy are the stars of a show-within-a-show called The Adventures of Mermaid Man and Barnacle Boy, but they are also real superheroes within the SpongeBob SquarePants universe.

The two are now very old and currently reside at Shady Shoals Rest Home. However, their two biggest fans (SpongeBob SquarePants and Patrick Star) convinced them to come out of retirement.


Mermaid Man is a parody of both Aquaman and Batman. He wears a nearly identical costume in every episode (to shells on each side) and his powers, which include being able to control the creatures of the sea, are also similar to those of Aquaman. Mermaid Man and Barnacle Boy's TV show and method of fighting crime are based on the campy 60's Batman TV show, their secret headquarters, the Mermalair, is a parody of the Batcave, and their vehicle, the invisible boatmobile is a parody of both the Batmobile and Wonder Woman's invisible jet.

Of note, he and Barnacle Boy are virtually completely human in appearance, except that they are the same size as the other characters of SpongeBob SquarePants, unlike the humans in the two movies.

Mermaid Man, as well as Barnacle Boy, are both humans, and it has been confirmed that they once lived on land. Mermaid Man has a circular body and thin legs. His costume is very similar to that of Aquaman, having an orange shirt, green pants, and seashells on his nipples. He also wears pink slippers due to his age. He wears a purple starfish on his nose and has a purple belt with a metallic blue "M" on it that has the ability to shrink or incinerate people, unlike Aquaman.

Role in video games

Operation Krabby Patty

Mermaid Man makes a cameo with Barnacle Boy in the level "Boating School 101."


SpongeBob wants Mermaid Man and Barnacle Boy to sign a photograph for Patrick's birthday. However, they want to get rid of SpongeBob and send him on random tasks around Bikini Bottom.

Revenge of the Flying Dutchman

A costume of him can be accessed via the changing tent in the console version.

Employee of the Month

Mermaid Man and Barnacle Boy are in Rock Bottom when Patrick and Mermaid Man have a soda drinking burping contest. Patrick wins but Mermaid Man gets very bad gas that makes him unable to stand up and SpongeBob finds help to get him in the invisible boatmobile to leave Rock Bottom.

Battle for Bikini Bottom

Mermaid Man and Barnacle Boy appear in the Mermalair but Plankton's robots have invaded it.

They can also be seen in the levels "Jellyfish Fields" and "Kelp Forest."

The SpongeBob SquarePants Movie video game

A costume of him is unlockable as an extra in the console version.

Nicktoons Freeze Frame Frenzy

Him and Barnacle Boy makes a cameo in Nicktoons Freeze Frame Frenzy as an out of place character the player must photograph.

Lights, Camera, Pants!

Mermaid Man and Barnacle Boy appear during a new episode being directed by Gill Hammerstein. In it, they are falsely accused of destroying the Sand Stadium when it was actually stolen by the Sneaky Hermit. However, when they are sent to Bikini Bottom Jail, the prison warden tells them what is really going on and lets them go so they can catch the villain, thus accidentally letting the Dirty Bubble and Man Ray go free.

Mermaid Man and Barnacle Boy go to Goo Lagoon and to the Krusty Krab to find clues. When they go to the Chum Bucket, they discover that Man Ray and the Dirty Bubble are using the mayor's child as their captive in an attempt to help the Sneaky Hermit's plans. They reluctantly make a truce with the villains and work together to find the Sneaky Hermit with some help from an expert hunter from Jellyfish Fields.

They manage to track down the hermit and foil his plan of putting Bikini Bottom on his back so he can have a home. When the crisis ends, they return to the Sand Stadium to continue watching the musical performance.

The Yellow Avenger

SpongeBob acquires Mermaid Man's powers and has to defeat all of his enemies.

Creature from the Krusty Krab

He appears briefly along with many characters.

SpongeBob's Truth or Square

Him and Barnacle Boy appear in the Mermalair and SpongeBob's bedroom.

SpongeBob's Boating Bash

Mermaid Man and Barnacle Boy appear when SpongeBob and Patrick want to borrow the invisible boatmobile.

They later appear when SpongeBob gets his "license" from Seymour Scales. Mermaid Man and Barnacle Boy later arrest Seymour and Mermaid Man calls him evil.

They are also unlockable characters who drive in the same boat during the races.

SpongeBob SquigglePants

He appears in some of the Comic Book nano-games.

Nicktoons Unite!

SpongeBob can be seen wearing a costume of him as an unlockable extra in the console version.

Nicktoons: Android Invasion

Him and Barnacle Boy are mentioned after SpongeBob save Manny Rivera.

Nicktoons MLB

Him and Barnacle Boy are seen as a card.



Mermaid Man when he was younger

Mermaid Man is an old man who is overweight and very round in shape. He exhibits several typical characteristics of an elderly man, such as white hair, poor sight and hearing, crankiness, and memory loss, often forgetting what he is thinking about or doing. Elements of his costume not shared by Aquaman include an M-shaped belt buckle that is metallic blue and his belt is purple (several versions of Aquaman, however, wear an A-shaped belt buckle and his belt is yellow), a purple star-shaped mask, a scallop-shell bra (which is also a cell phone), and a pair of pink fuzzy slippers. The purple-shaped star over his nose was given to Mermaid Man by a mermaid. It is the only way that he can breathe underwater.

Mermaid Man has a sidekick, Barnacle Boy, whom he still treats like a child even though Barnacle Boy is 68 years old (according to "Mermaid Man and Barnacle Boy V"). Mermaid Man also notably goes crazy whenever anyone says "evil."


According to Mermaid Man, his powers all come from his costume. His abilities include summoning and controlling sea creatures, high-speed swimming (used to create the "Raging Whirlpool"), water balls, super strength, and the ability to survive underwater. While Mermaid Man retains all of these abilities, they are not as powerful as they were in his prime.


Mermaid Man's Belt
In addition to this, his belt features a wide array of abilities, similar to Batman's utility belt, as seen in "Mermaid Man and Barnacle Boy IV." These abilities are usually manifested as a beam or ray. The only one specifically named on the show is the "Small Ray," which shrinks things, but various effects are created when SpongeBob tests various buttons on Squidward in an attempt to reverse the Small Ray's effects. These include several bizarre mutations and effects, such as causing the victim to suddenly catch on fire, turn inside out, get a clump of snakes covering their head, or to be cut in half by scissors. Despite being the operator of the belt, he doesn't know how it works

It also contains the power of Wumbo. Wumbology is the study of everything Wumbo. Wumbo means the "opposite of mini," as seen in "Mermaid Man and Barnacle Boy IV."

Also, in the video game Lights, Camera, Pants!, Mermaid Man states that his belt has a "Chin Cam," a hidden camera that takes pictures of his chin.

In-universe merchandise based on him

113b - The Card 179

The Mermaid Man and Barnacle Boy trading card

In the episode "Ditchin'," a Mermaid Man and Barnacle Boy origin comic book is shown. One panel features a man resembling Barnacle Boy and a woman resembling Mermaid Man in a spaceship. The woman has two children in her arms resembling Mermaid Man and Barnacle Boy, implying that the heroes are brothers. However, this book was advertised as being brand-new, so it is likely that this story is false.

More merchandise can also be seen in "Mermaid Man Begins," thus causing a dispute on his and Barnacle Boy's backstory. In "The Card," 54 trading cards have also been made as entertainment for fans. Toys were manufactured as part of a Krusty Krab promotion in "Mermaid Man vs. SpongeBob."


Mermaid Man and Barnacle Boy have several supervillain enemies. Their two most notable foes are Man Ray and Dirty Bubble. Other villains include the Atomic Flounder, who is now retired, the Sinister Slug, the Jumbo Shrimp, Kelp Thing, and the Moth, a humanoid moth who steals light, as seen in "Night Light." Mermaid Man claims to have been trying to catch the Moth for 57 years due to his very small size.

The Mermalair features a "villain containment chamber," where villains such as Man Ray and Prawn are imprisoned in frozen tartar sauce, as seen in "Mermaid Man and Barnacle Boy III" and the video game Battle for Bikini Bottom.

Similarities to DC and Marvel Superheroes

  • The invisible boatmobile is a parody of the invisible jet of Wonder Woman and the Batmobile of Batman.
  • His friends and enemies are similar to Batman and Aquaman's' friends and enemies such as Barnacle Boy, Elastic Waistband, Miss Appear, and Man Ray being parodies of Aqualad, Robin, Plastic Man, Elongated Man, Wonder Woman, and Black Manta.
  • In "Back to the Past," Mermaid Man's younger self is voiced by Adam West, who portrayed Batman in the TV series.
  • The fight sequences have scenes with words like "POW!," "BAM!," and "NAP!," another possible nod to Adam West's portrayal of Batman.
  • His utility belt seems to contain gadgets for any situation, much like Batman's.
  • His sidekick, Barnacle Boy, is a parody of both Aqualad and Robin.
  • His supposedly fake origins (shown in "Ditchin'") suggests he is from outer space.
  • He and Barnacle Boy spring into action after they "say the oath" while touching the tips of two golden rings. This is an obvious parody of The Wonder Twins both with the rings and the oath "Wonder Twin powers activate!" It should be noted that the Green Lantern Corps of DC also say an oath, and wield "power rings" as their armament.
  • The way he shouts to the place he wants to go is a parody of the famous way Batman shouts "to the Batcave," mostly in Adam West's TV show (sometimes, followed by the singular eye-catch).
  • In "Shuffleboarding," Mermaid Man has a boomerang called the Mermarang, which is a parody of Batman's Batarang.
  • His superhero group, The International Justice League of Super Acquaintances, is a parody of the Justice League of America.
  • He is very similar to the DC and Marvel superheroes, Aquaman and Namor (though mostly Aquaman).


Barnacle mermaid

An early version of Mermaid Man with his friend Barnacle Bill

  • In the episode "Mermaid Man Begins" it is revealed that Mermaid Man's real name is Ernie, a reference to his voice actor, the late Ernest Borgnine.
  • A common stereotype of the elderly, Mermaid Man is easily annoyed, falls asleep often, and very senile. 
  • On the DVD episode listings, his name is spelled as "Mermaidman."
  • When it comes to mermaids, seashells are used in place of bras or bikini tops (as seen with Ariel from Disney's The Little Mermaid). Mermaid Man sports a seashell bra, thus continuing his mermaid motif.
  • His name in the Russian dub of SpongeBob SquarePants is "Морской Супермэн," which roughly translates to "Marine Superman."
  • In the Hebrew version, Mermaid Man is called "ish hayam" (sea man).
  • He and Barnacle Boy are possibly retired from the show due to the deaths of their respective actors, or at least now appear on pictures or as toys. 


  • [to SpongeBob] "Listen up, you villains. I wanna eat my meatloaf! If you don't get out of here, then by the power invested in me, I now pronounce you man and wife!"
    • "You may kiss the bride!"
  • "Stop shoutin', I'm nappin'!"
  • "Evil!"
  • "To the chiropractor! Away!"
  • "Up, up and away!"
  • "Buy more cards!"
  • "Haven't you two idiots done enough damage?"
  • "Remember, kids... no one can imprison you for reading!"
  • "Keep your tongue out of my tartar sauce!"
  • "What are you wearing? Then I'll take a large pepperoni pizza."
  • "Evil can't park here between the hours of 6:00 am and 12:00 pm!"
  • "Did you set it to Wumbo?"
  • "Mermaid Man and Barnacle Boy... unite!"
  • "Oh, youth... cut down in its prime..."
  • "How's your adult-sized Krabby Patty treating you, Barnacle Man?
  • "If you wanna grow up strong like me... you gotta leave room for seconds."
  • "We have to get back to those stolen naggie daddies."
  • "Vindication is ours! Vindi... how did I get up here?"


Characters (VE)


SpongeBobPatrickSquidwardMr. KrabsPlanktonKarenSandyMrs. PuffPearlGary


PatchyPottyFrench NarratorMermaid ManBarnacle BoyFlying DutchmanKing NeptuneLarry the LobsterHarold SquarePantsMargaret SquarePantsGrandma SquarePantsJohnny ElainePerch PerkinsBikini BottomitesJellyfish

Major Background

Bubble BassFredHaroldNat PetersonOld Man JenkinsSandalsTomNorma Rechid



Mermaid Man and Barnacle Boy (VE)

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