| Season 1
|
| File:Mermaid Man and Barnacle Boy 088.png
|
6a
|
"Mermaid Man and Barnacle Boy" (tr • ga)
|
Major, debut; SpongeBob and Patrick attempt to bring Mermaid Man and Barnacle out of retirement.
|
| File:Mermaid Man and Barnacle Boy II 129.png
|
20b
|
"Mermaid Man and Barnacle Boy II" (tr • ga)
|
Major; Mermaid Man and Barnacle Boy spend a day on the town with SpongeBob.
|
| Season 2
|
| File:Mermaid Man and Barnacle Boy III 025.png
|
31a
|
"Mermaid Man and Barnacle Boy III" (tr • ga)
|
Minor; he and Mermaid Man leave SpongeBob and Patrick in charge of the Mermalair while the two are away.
|
| Season 3
|
| File:Mermaid Man and Barnacle Boy IV 010.png
|
45a
|
"Mermaid Man and Barnacle Boy IV" (tr • ga)
|
Supporting; gets shrink along with everyone else in town.
|
| File:Mermaid Man and Barnacle Boy V 185.png
|
52b
|
"Mermaid Man and Barnacle Boy V" (tr • ga)
|
Major; after being childishly teased for having "Boy" in his name, Barnacle Boy joins the dark side and a team emerges to try and stop him and his new allies.
|
| Season 4
|
| File:Have You Seen This Snail 016.png
|
63
|
"Have You Seen This Snail?" (tr • ga)
|
Imaged cameo/mentioned
|
| File:Mermaid Man & Barnacle Boy VI The Motion Picture 194.png
|
67b
|
"Mermaid Man & Barnacle Boy VI: The Motion Picture" (tr • ga)
|
Major; He and Mermaid Man play in a movie (produced by SpongeBob).
|
| Season 5
|
| File:Night Light 156.png
|
82b
|
"Night Light" (tr • ga)
|
Minor; accidentally summoned by SpongeBob and Patrick.
|
| File:Mermaid Man vs. SpongeBob 094.png
|
94b
|
"Mermaid Man vs. SpongeBob" (tr • ga)
|
Major; brainwashed by Plankton.
|
| Season 6
|
| File:The Card 033.pngFile:The Card 197.png
|
113b
|
"The Card" (tr • ga)
|
Cameo on cards and card packs
|
| File:Ditchin' 070.png
|
114b
|
"Ditchin'" (tr • ga)
|
Supporting; seen signing books for fans.
|
| File:Shuffleboarding 052.png
|
117a
|
"Shuffleboarding" (tr • ga)
|
Major; accidentally injuried by SpongeBob and Patrick and confined to the Bikini Bottom Hospital for most of the episode.
|
| File:Toy Store of Doom 020.png
|
120b
|
"Toy Store of Doom" (tr • ga)
|
Toy cameo; a toy version of Barnacle Boy is chewed on by Patrick.
|
| Season 7
|
| File:SpongeBob's Last Stand 064.png
|
134
|
"SpongeBob's Last Stand" (tr • ga)
|
Cameo
|
| File:Back to the Past 115.png
|
135a
|
"Back to the Past" (tr • ga)
|
Major
|
| File:The Bad Guy Club for Villains 105.png
|
135b
|
"The Bad Guy Club for Villains" (tr • ga)
|
Major (as younger self)
|
| N/A
|
136a
|
"A Day Without Tears" (tr • ga)
|
Mentioned
|
| File:The Cent of Money 192.png
|
139b
|
"The Cent of Money" (tr • ga)
|
Cameo
|
| Season 8
|
| File:Mermaid Man Begins 123.png
|
163a
|
"Mermaid Man Begins" (tr • ga)
|
Major; he and Mermaid Man tell the origin story about how they became superheroes.
|
| File:Super Evil Aquatic Villain Team Up is Go! 196.png
|
176a
|
"Super Evil Aquatic Villain Team Up is Go!" (tr • ga)
|
Supporting; he and Mermaid Man go to the Krusty Krab to arrest Man Ray.
|
| Season 9
|
| File:Patrick-Man! 035.png
|
180a
|
"Patrick-Man!" (tr • ga)
|
Cameo; seen on TV in an episode of The Adventures of Mermaid Man and Barnacle Boy before Patrick turns off the TV.
|
| File:Company Picnic 065.png
|
192a
|
"Company Picnic" (tr • ga)
|
Likeness; SpongeBob uses mustard to make himself look like Barnacle Boy.
|
| File:SpongeBob LongPants 001.png
|
195a
|
"SpongeBob LongPants" (tr • ga)
|
Throughout the episode, he appears on posters and billboards for "The Dark Tide Rises."
|
| File:Mall Girl Pearl 070.png
|
197a
|
"Mall Girl Pearl" (tr • ga)
|
Non-speaking, walking through the mall along with Mermaid Man.
|
| File:Snail Mail 005.png
|
202b
|
"Snail Mail" (tr • ga)
|
Cameo in a magazine.
|
| Season 10
|
| File:Mermaid Pants 135.png
|
205b
|
"Mermaid Pants" (tr • ga)
|
Cameo in a magazine.
|
| File:Trident Trouble 027.png
|
211b
|
"Trident Trouble" (tr • ga)
|
Cameo in a magazine.
|
| Season 11
|
| File:Man Ray Returns 088.png
|
219a
|
"Man Ray Returns" (tr • ga)
|
Cameo (non speaking); seen taking a cryonic nap at Shady Shoals Rest Home.
|
| File:The Legend of Boo-Kini Bottom 004.png
|
220
|
"The Legend of Boo-Kini Bottom" (tr • ga)
|
Costume; a child appears wearing a costume.
|
| File:Bunny Hunt 110.png
|
223b
|
"Bunny Hunt" (tr • ga)
|
Cameo in SpongeBob's comic books.
|
| File:Squid Noir 133.png
|
224a
|
"Squid Noir" (tr • ga)
|
Cameo in posters and comic books.
|
| File:Bottle Burglars 063.png
|
230b
|
"Bottle Burglars" (tr • ga)
|
Cameo in a magazine.
|
| File:Call the Cops 155.png
|
236a
|
"Call the Cops" (tr • ga)
|
Cameo in a magazine.
|
| File:Goons on the Moon 023.png
|
237
|
"Goons on the Moon" (tr • ga)
|
Cameo in a magazine.
|
| File:Appointment TV 168.png
|
238a
|
"Appointment TV" (tr • ga)
|
Acted out by Patrick Star.
|
| Season 12
|
| File:The Krusty Slammer 154.png
|
244a
|
"The Krusty Slammer" (tr • ga)
|
Cameo on television.
|
| File:Swamp Mates 054.png
|
247a
|
"Swamp Mates" (tr • ga)
|
Non-speaking cameo (younger)
|
| File:SpongeBob's Big Birthday Blowout 401.png
|
254-255
|
"SpongeBob's Big Birthday Blowout" (tr • ga)
|
Cameo as a toy.
|
| Season 13
|
| File:Captain Pipsqueak 025.png
|
277a
|
"Captain Pipsqueak" (tr • ga)
|
Cameo on TV.
|
| File:Karen for Spot 111.png
|
281b
|
"Karen for Spot" (tr • ga)
|
Cameo (non-speaking); He appears at the Doomsday Device Expo in his Barnacle Man costume.
|
| File:SpongeBob on Parade 149.png
|
284b
|
"SpongeBob on Parade" (tr • ga)
|
2 cameos (non-speaking); Him and Mermaid Man are part of the Bikini Bottom Parade.
|
| Season 14
|
| File:Necro-Nom-Nom-Nom-I-Con 103.png
|
299b
|
"Necro-Nom-Nom-Nom-I-Con" (tr • ga)
|
Cameo in Bubble Bass's pajamas
|
| File:The Dirty Bubble Bass 008.png
|
305a
|
"The Dirty Bubble Bass" (tr • ga)
|
Cameo on comic book shelf
|
| Season 15
|
| File:495930284302.jpg
|
310a
|
"Biscuit Ballyhoo" (tr • ga)
|
Cameo in a frame at Shady Shoals Rest Home.
|
| File:Captain Quasar- The Next Iteration 046.png
|
319b
|
"Captain Quasar: The Next Iteration" (tr • ga)
|
Cameo; Cameo as a poster.
|
