Season 1
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6a
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"Mermaid Man and Barnacle Boy" (tr • ga)
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Major, debut
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20b
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"Mermaid Man and Barnacle Boy II" (tr • ga)
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Major
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Season 2
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31a
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"Mermaid Man and Barnacle Boy III" (tr • ga)
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Minor; he and Mermaid Man leave SpongeBob and Patrick in charge of the Mermalair while the two are away.
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Season 3
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45a
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"Mermaid Man and Barnacle Boy IV" (tr • ga)
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Supporting; gets shrink along with everyone else in town.
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52b
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"Mermaid Man and Barnacle Boy V" (tr • ga)
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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.
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Season 4
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63
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"Have You Seen This Snail?" (tr • ga)
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Imaged cameo/mentioned
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67b
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"Mermaid Man & Barnacle Boy VI: The Motion Picture" (tr • ga)
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Major
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Season 5
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82b
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"Night Light" (tr • ga)
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Minor; accidentally summoned by SpongeBob and Patrick.
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94b
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"Mermaid Man vs. SpongeBob" (tr • ga)
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Major; brainwashed by Plankton.
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Season 6
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113b
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"The Card" (tr • ga)
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Cameo on cards and card packs
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114b
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"Ditchin'" (tr • ga)
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Supporting; seen signing books for fans.
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117a
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"Shuffleboarding" (tr • ga)
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Major; accidentally injuried by SpongeBob and Patrick and confined to the Bikini Bottom Hospital for most of the episode.
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120b
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"Toy Store of Doom" (tr • ga)
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Toy cameo; a toy version of Barnacle Boy is chewed on by Patrick.
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Season 7
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134
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"SpongeBob's Last Stand" (tr • ga)
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Cameo
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135a
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"Back to the Past" (tr • ga)
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Major
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135b
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"The Bad Guy Club for Villains" (tr • ga)
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Major (as younger self)
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N/A
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136a
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"A Day Without Tears" (tr • ga)
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Mentioned
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139b
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"The Cent of Money" (tr • ga)
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Cameo
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Season 8
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163a
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"Mermaid Man Begins" (tr • ga)
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Major; he and Mermaid Man tell the origin story about how they became superheroes.
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176a
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"Super Evil Aquatic Villain Team Up is Go!" (tr • ga)
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Supporting; he and Mermaid Man to the Krusty Krab to arrest Man Ray.
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Season 9
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180a
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"Patrick-Man!" (tr • ga)
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Cameo; seen on TV in an episode of The Adventures of Mermaid Man and Barnacle Boy before Patrick turns off the TV.
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192a
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"Company Picnic" (tr • ga)
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Likeness; SpongeBob uses mustard to make himself look like Barnacle Boy.
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195a
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"SpongeBob LongPants" (tr • ga)
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Throughout the episode, he appears on posters and billboards for "The Dark Tide Rises."
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197a
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"Mall Girl Pearl" (tr • ga)
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Non-speaking, walking through the mall along with Mermaid Man.
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202b
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"Snail Mail" (tr • ga)
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Cameo in a magazine.
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Season 10
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205b
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"Mermaid Pants" (tr • ga)
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Cameo in a magazine.
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211b
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"Trident Trouble" (tr • ga)
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Cameo in a magazine.
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Season 11
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219a
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"Man Ray Returns" (tr • ga)
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Cameo (non speaking); seen taking a cryonic nap at Shady Shoals Rest Home.
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220
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"The Legend of Boo-Kini Bottom" (tr • ga)
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Costume; a child appears wearing a costume.
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223b
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"Bunny Hunt" (tr • ga)
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Cameo in SpongeBob's comic books.
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224a
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"Squid Noir" (tr • ga)
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Cameo in posters and comic books.
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230b
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"Bottle Burglars" (tr • ga)
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Cameo in a magazine.
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236a
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"Call the Cops" (tr • ga)
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Cameo in a magazine.
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237
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"Goons on the Moon" (tr • ga)
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Cameo in a magazine.
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238a
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"Appointment TV" (tr • ga)
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Acted out by Patrick Star.
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Season 12
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244a
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"The Krusty Slammer" (tr • ga)
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Cameo on television.
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247a
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"Swamp Mates" (tr • ga)
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Non-speaking cameo (younger)
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254-255
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"SpongeBob's Big Birthday Blowout" (tr • ga)
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Cameo as a toy.
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Season 13
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277a
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"Captain Pipsqueak" (tr • ga)
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Cameo on TV.
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281b
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"Karen for Spot" (tr • ga)
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Cameo (non-speaking); He appears at the Doomsday Device Expo in his Barnacle Man costume.
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284b
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"SpongeBob on Parade" (tr • ga)
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2 cameos (non-speaking); Him and Mermaid Man are part of the Bikini Bottom Parade.
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