| Season 1
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| File:Bummer Jobs 042.png
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1b
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"Bummer Jobs" (tr • ga)
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Supporting; he is one of the viewers of The Patrick Show!, where he is amazed at Patrick's tie-tying antics. Patrick then falls out of his TV and lands on him during his struggle, causing Slappy Laszlo to admire the 3D effects of the show.
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| File:Stair Wars 130.png
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2a
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"Stair Wars" (tr • ga)
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Minor; he appears among the crowd who comes to assist Patrick and GrandPat in their stair war, taking Patrick's side in those who wish to go up the stairs. He steals Fred's bread weapon, slathers butter on it, and then slathers butter on Fred's face.
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| File:Lost in Couch 191.png
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3a
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"Lost in Couch" (tr • ga)
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Minor; he appears outside of the window of Patrick's house after Squidina tells Patrick his fan-base is counting on him. He tells them to not mind him and that he "loves a good failure." At the end of the episode, he is disappointed when everything works out.
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| File:Pat-a-thon 022.png
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3b
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"Pat-a-thon" (tr • ga)
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Supporting; he is one of the four characters Patrick has answer phone calls (along with Squidward, a worm, and a can of beans). At the end of the episode, he rides the dangerous obstacle course intended for GrandPat with Patrick.
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| File:The Yard Sale 238.png
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4
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"The Yard Sale" (tr • ga)
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Minor; he is seen at the yard sale, where he asks GrandPat about the cost of a brain he wants. GrandPat reveals that the brain isn't his, and Patrick states that it isn't his either, so Slappy is given the brain for free. Slappy then places a propeller hat onto the brain and spins the propeller, lifting the brain into the sky as he giggles madly, commenting that the brain is free.
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| File:Squidina's Little Helper 080.png
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5a
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"Squidina's Little Helper" (tr • ga)
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Cameo; he is one of the people applying to be Squidina's helper, where he giggles unnervingly when trying to give her his resume.
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| File:I Smell a Pat 145.png
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5b
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"I Smell a Pat" (tr • ga)
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Cameo; he picks up Mr. Stinky and mistakes him for a cat, before Mr. Stinky farts in his face, melting off his skin.
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| File:Terror at 20,000 Leagues 031.png
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8
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"Terror at 20,000 Leagues" (tr • ga)
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Minor; he is in the crowd of The Patrick Show! and wears a fruit headdress, red top and skirt, and white beaded necklace as a Halloween costume. He gives a kid in the crowd broccoli as a treat, scaring the kid away.
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| File:Pearl Wants to Be a Star 186.png
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12a
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"Pearl Wants to Be a Star" (tr • ga)
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Minor; he shows up whenever Pearl messes up her act for The Patrick Show! the last two times, saying that it at least ended tragically, and that it had a catastrophic ending.
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| File:Mid-Season Finale 051.png
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13b
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"Mid-Season Finale" (tr • ga)
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Supporting; he has a segment in the mid-season finale called "Slappy's Poem Corner," where he recites a poem while putting a dead plant onto his head. Slippy then floats on stage and compliments his 'revolting' smell, and the two leave the stage in each other's arms.
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| File:FitzPatrick 008.png
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14b
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"FitzPatrick" (tr • ga)
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Minor; he officiates Patrick's wedding to a cake, and watches Patrick's show later.
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| File:Uncredible Journey 159.png
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15a
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"Uncredible Journey" (tr • ga)
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Cameo; he wears a party outfit to Tinkle's supposed funeral.
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| File:Host-a-Palooza 060.png
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15b
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"Host-a-Palooza" (tr • ga)
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Minor; he appears three times. He first appears after Patrick injures himself during The Patrick Show! and the destruction was delightful. He later appears when the audience is booing when Tinkle chases the vacuum and he says he doesn't know why the audience is booing and he loves toilet humor. He last appears when the audience pretends to be Patrick and he says there's so many buffoons and it's such buffoonery.
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| File:Patrick's Got a Zoo Loose 011.png
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17b
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"Patrick's Got a Zoo Loose" (tr • ga)
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Cameo; he drives Nosferatu's coffin away from The Patrick Show!
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| File:Home ECCH! 133.png
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19a
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"Home ECCH!" (tr • ga)
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Supporting; he teaches Squidina how to make pickle pie during the final segment of "Home Ink With Squidina."
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| File:The Prehistoric Patrick Star Show 021.png
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20b
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"The Prehistoric Patrick Star Show" (tr • ga)
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Minor; a caveman version of Slappy throws a bone at Patrick to wake him up.
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| File:The Patrick Show Sells Out 182.png
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21a
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"The Patrick Show Sells Out" (tr • ga)
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Minor; he gives Mr. Krabs a commercial for Patrick's restaurant.
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| File:Neptune's Ball 189.png
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21b
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"Neptune's Ball" (tr • ga)
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Minor; he watches Patrick's show.
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| File:The Starry Awards 097.png
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23a
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"The Starry Awards" (tr • ga)
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Minor; he faints after eating poisoned foods.
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| File:Stuntin' 155.png
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24a
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"Stuntin'" (tr • ga)
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Minor; he points out how dangerous GrandPat's stunts are.
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| File:Olly Olly Organ Free 062.png
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24b
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"Olly Olly Organ Free" (tr • ga)
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Cameo (non-speaking); Patrick attaches himself to a flag on Slappy's boat.
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| File:Which Witch is Which 114.png
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25a
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"Which Witch is Which?" (tr • ga)
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Minor; Patrick, Cecil, and eventually Agnes are turned into lookalikes of him.
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| File:Get Off My Lawnie 066.png
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25b
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"Get Off My Lawnie" (tr • ga)
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Supporting; he is one of Granny Tentacles' obsessive fans.
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| File:Patrick's Prison Pals 151.png
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26b
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"Patrick's Prison Pals" (tr • ga)
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Minor; he asks Sockeye Sammy, whom he believes is Patrick, to give him a tooth for his shrine.
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| Season 2
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| File:The Patrick Show Cashes In 106.png
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27a
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"The Patrick Show Cashes In" (tr • ga)
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Minor; he wants to buy a T-shirt from Patrick.
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| File:Family Plotz 064.png
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29b
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"Family Plotz" (tr • ga)
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Minor; he works at the Eternal Rest Mortuary.
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| File:There Goes the Neighborhood 052.png
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30b
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"There Goes the Neighborhood" (tr • ga)
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Minor; he breaks into someone's house.
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| File:Dr. Smart Science 174.png
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31b
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"Dr. Smart Science" (tr • ga)
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Minor; he gets blasted with electricity.
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| File:Tying the Klop-Knot 088.png
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32b
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"Tying the Klop-Knot" (tr • ga)
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Cameo; he is one of the lawnies Patrick gets rid of to make room for Klopnodian guests.
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| File:Chum Bucket List 161.png
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33a
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"Chum Bucket List" (tr • ga)
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Minor; he watches Patrick's dangerous stunt.
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| File:Big Baby Patrick 072.png
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33b
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"Big Baby Patrick" (tr • ga)
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Minor; Cecil runs him over.
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| File:Is There a Director in the House 055.png
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34a
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"Is There a Director in the House?" (tr • ga)
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Minor; he is one of Patrick's new directors for The Patrick Show!
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| File:Pick Patrick's Path 200.png
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38b
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"Pick Patrick's Path" (tr • ga)
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Supporting; he is one of the voters for the show, and rigs the vote at the end in favor of Patrick having a sleepover with him.
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| File:Time to Eat 193.png
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39a
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"Time to Eat" (tr • ga)
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Cameo, non-speaking; appears in the audience as a woolly clammoth.
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| File:Cleanin' House 149.png
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39b
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"Cleanin' House" (tr • ga)
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Supporting; he takes Patrick's stuff to help him clean the house.
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| Season 3
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| File:The Patrick Show After Dark 010.png
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40b
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"The Patrick Show After Dark" (tr • ga)
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Minor; he suggests the idea for The Patrick Show After Dark.
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| File:All Bot Myself 045.png
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41b
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"All Bot Myself" (tr • ga)
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Minor; he gets scared off by a sea bear.
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| File:Star-Robics 068.png
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42a
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"Star-Robics" (tr • ga)
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Minor; he is one of the lawnies.
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| File:Patrick Show Land 145.png
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43a
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"Patrick Show Land" (tr • ga)
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Minor; he is one of the lawnies, and puts on a Patrick costume.
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| File:Legend of the Lost Bathroom 198.png
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43b
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"Legend of the Lost Bathroom" (tr • ga)
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Minor; he uses the bathroom inside Patrick's heart.
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| File:Day of the Dartfish 194.png
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45b
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"Day of the Dartfish" (tr • ga)
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Minor; he steals stuff from The Patrick Show!, and later has a change of heart and returns it all.
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| File:Patty Poo 098.png
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46a
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"Patty Poo" (tr • ga)
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Minor; he rips off his arm and names it "Slappy Poo," after Patty Poo.
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| File:Swaptoberfest 197.png
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46b
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"Swaptoberfest" (tr • ga)
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Minor; he is disguised as Granny Tentacles.
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| File:Pat Roast 022.png
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47b
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"Pat Roast" (tr • ga)
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Minor; he is the only one to like Patrick's comedy routine, and buries Harold for insulting Patrick.
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| File:A Fool Schooled 008.png
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48b
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"A Fool Schooled" (tr • ga)
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Cameo; he appears in the audience.
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| File:TBA.png
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49
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"Something Stupid This Way Comes" (tr • ga)
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Cameo; his head is seen in Pat the Hapless's collection.
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| File:Get Ouch 129.png
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51a
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"Get Ouch" (tr • ga)
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Minor; he appears in the animal control van.
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| File:Squidina's Holidaze Special 035.png
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52
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"Squidina's Holidaze Special" (tr • ga)
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Minor; his head appears in a snowman, and he plays King Neptune in the play.
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| Season 4
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| File:Sitcom Stars 200.png
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53a
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"Sitcom Stars" (tr • ga)
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Cameo; he takes Patrick's place at the end of the episode.
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| File:The Dated Game 075.png
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54a
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"The Dated Game" (tr • ga)
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Supporting; he is Bachelor #1 in the dating game show.
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