| Season 1
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1a
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"Help Wanted" (tr • ga)
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Debut; cameo.
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5a
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"Pizza Delivery" (tr • ga)
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Cameo; seen on a picture and on a rock.
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9a
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"Nature Pants" (tr • ga)
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Minor; they bite SpongeBob while he sleeps.
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| Season 2
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21a
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"Your Shoe's Untied" (tr • ga)
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Cameo; SpongeBob asks them if they know how to tie shoes.
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27a
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"Prehibernation Week" (tr • ga)
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Cameo; seen on a rock.
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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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Multiple cameos on a rock.
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| Season 6
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120a
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"No Hat for Pat" (tr • ga)
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Minor; Mr. Krabs tries to make Patrick fall into a barrel of sea urchins, but Squidward falls first.
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| Season 7
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128a
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"Growth Spout" (tr • ga)
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Cameo; seen on a rock.
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148b
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"Whelk Attack" (tr • ga)
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Cameo; seen on the title card.
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| Season 8
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157a
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"Squidward's School for Grown-Ups" (tr • ga)
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Supporting; regular urchins appear on a rock, and a big brown version of sea urchins is Patrick's "beard."
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| Season 9
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183a
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"Eek, an Urchin!" (tr • ga)
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Major; SpongeBob, Squidward, Mr. Krabs and Plankton try to get rid of a sea urchin in the Krusty Krab.
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186b
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"Plankton's Pet" (tr • ga)
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Cameo; SpongeBob opens a cage with wild animals in the shelter and they chase SpongeBob and Plankton.
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199a
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"Sold!" (tr • ga)
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Cameo; one is seen on a rock.
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| Season 10
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211a
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"Plankton Retires" (tr • ga)
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Cameo; the Krabby Patty Plankton managed to steal is full of sea urchins.
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212a
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"The Incredible Shrinking Sponge" (tr • ga)
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Supporting; a customer finds an urchin in the Krabby Patty, and SpongeBob frees him. When SpongeBob is shrunk, he finds the same urchin under the stove, and releases him from mousetrap. After that, the urchin chases him.
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| Season 11
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| Dialogue mention
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225a
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"Cuddle E. Hugs" (tr • ga)
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Mentioned; Squidward initially mistakes the Aged Patty for an urchin.
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231a
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"My Leg!" (tr • ga)
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Cameo; SpongeBob prevents Fred from stepping on them.
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234b
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"ChefBob" (tr • ga)
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Cameo; seen under the stove.
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| Season 12
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242b
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"Gary & Spot" (tr • ga)
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Cameo; seen in the animal shelter.
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244b
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"Pineapple RV" (tr • ga)
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Cameo; one appears as a toy.
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253a
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"Jolly Lodgers" (tr • ga)
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Minor; they invade Squidward's house, making him leave.
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257b
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"Breakin'" (tr • ga)
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Cameo; seen crawling out of the employee break room.
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| Season 13
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269b
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"Squidward's Sick Daze" (tr • ga)
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Cameo; SpongeBob uses one to cure Squidward.
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278a
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"Squidferatu" (tr • ga)
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Cameo; they dance in Squidward's garden before he uses bug spray to get them out.
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280b
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"Wallhalla" (tr • ga)
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Cameo; they chew on Wally's mold garden.
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281a
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"Salty Sponge" (tr • ga)
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Cameo on a rock; mentioned to have infested the Krusty Krab.
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293a
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"Big Top Flop" (tr • ga)
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Minor; Mr. Krabs tries to sabotage SpongeBob's performance by throwing urchins at him. Later, Mr. Krabs also throws urchins at Ringmaster Mudkrab, then the urchins gnaw at Mr. Krabs' rope.
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| Season 14
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298b
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"Pet the Rock" (tr • ga)
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Cameo; an urchin that resembles Ouchie appears in Pets! Sir Urchin also appears on TV.
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