Season 1
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6a
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"Mermaid Man and Barnacle Boy" (tr • ga)
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Major, debut; SpongeBob and Patrick try to bring him and Barnacle Boy back.
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20b
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"Mermaid Man and Barnacle Boy II" (tr • ga)
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Major; SpongeBob wins a conch shell in a contest to summon Mermaid Man and Barnacle Boy, where they eventually take him on their daily patrol.
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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 Barnacle Boy hire SpongeBob and Patrick to watch their lair.
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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; accidentally leaves his belt, which is found by SpongeBob and attempts to return it to Mermaid Man but drives away before is can return the belt. Later, him and Barnacle alongside the rest of the town are shrink and kick SpongeBob's eye sockets.
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52b
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"Mermaid Man and Barnacle Boy V" (tr • ga)
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Major; Barnacle Boy leaves Mermaid for E.V.I.L., which causes Mermaid to team up with SpongeBob, Squidward, Patrick, and Sandy.
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N/A
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56a
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"Born Again Krabs" (tr • ga)
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Mentioned; after SpongeBob is taken away by the Flying Dutchman SpongeBob states "Mermaid Man and Barnacle Boy are the greatest. They're close personal friends of mine. They taught me everything."
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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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Cameo on the Mermaid Man and Barnacle Boy Paddle Ball Set
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67b
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"Mermaid Man & Barnacle Boy VI: The Motion Picture" (tr • ga)
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Major; when SpongeBob and Patrickfind out that a Mermaid Man and Barnacle Boy movie is in production and are using actors, so they make their own with the real heroes.
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Season 5
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82b
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"Night Light" (tr • ga)
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Minor; SpongeBob and Patrick accidentally summon him and Barnacle Boy when they shine a lighthouse which Mermaid Man and Barnacle to there is evil occurring.
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94b
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"Mermaid Man vs. SpongeBob" (tr • ga)
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Major; Plankton hypnotizes Mermaid Man and Barnacle Boy when he discovers the Krusty Krab has themed after them.
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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 with Barnacle Boy.
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117a
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"Shuffleboarding" (tr • ga)
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Major; he and Barnacle Boy are accidentally injured by SpongeBob and Patrick.
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120b
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"Toy Store of Doom" (tr • ga)
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Cameo as a toy which Patrick chews on.
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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; helps the Bikini Bottom remove the Shelly Superhighway.
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135a
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"Back to the Past" (tr • ga)
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Major; SpongeBob, Patrick, Mermaid Man and Barnacle Boy go back in time.
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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); investigates what the villains are up to.
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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; while watching the news it is mentioned that The Mermaid Man and Barnacle Boy Show will be shown seven times a day instead of eight.
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139b
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"The Cent of Money" (tr • ga)
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Cameo on card
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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; Mermaid Man tells SpongeBob and Patrick about how him and Barnacle Boy became superheroes.
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N/A
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174b
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"For Here or to Go" (tr • ga)
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Mentioned; Incidental 7 guesses Mermaid Man when asked how many sesame seeds are in the Sesame seed jar.
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176a
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"Super Evil Aquatic Villain Team Up is Go!" (tr • ga)
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Major; Mermaid Man and Barnacle Boy arrests 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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Minor (last episode produced before Ernest Borgnine's death); seen in an of The Adventures of Mermaid Man and Barnacle Boy.
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195a
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"SpongeBob LongPants" (tr • ga)
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Cameos 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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Cameo; seen at the Bikini Bottom Mall.
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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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209b
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"Plankton Gets the Boot" (tr • ga)
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Cameo as a toy.
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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)
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220
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"The Legend of Boo-Kini Bottom" (tr • ga)
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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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Appearance as an action figure.
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227a
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"Drive Happy" (tr • ga)
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Cameo as a bobble-head.
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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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Cameo in SpongeBob's MM&BB franchise; Acted out by Larry the Lobster.
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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; Acted out by Bubble Bass.
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265a
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"Bubble Bass's Tab" (tr • ga)
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Cameo on a sleeping bag
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Season 13
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274a
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"The Big Bad Bubble Bass" (tr • ga)
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Cameo as alarm clock and in poster
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277a
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"Captain Pipsqueak" (tr • ga)
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Cameo on TV
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281a
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"Salty Sponge" (tr • ga)
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Cameo on a comic book cover
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284b
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"SpongeBob on Parade" (tr • ga)
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2 cameos; Him and Barnacle Boy are part of the Bikini Bottom Parade.
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