| Season 5
|
|
81
|
"Friend or Foe" (tr • ga)
|
Minor; He was a friend of Krabs and his mother during the childhood of Krabs and Plankton, and helped them through their time of poverty. He is the first person to try Krabs' and Plankton's burger, and is knocked unconscious by the apparently contaminated patty. His poisoning was the reason that Mr. Krabs and Plankton fell out.
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| Season 7
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| File:The Main Drain 109.png
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141b
|
"The Main Drain" (tr • ga)
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Supporting; He lures SpongeBob and Patrick into his house and asks them why are they asking for The Drain, and after SpongeBob and Patrick explain him, he says The Drain exists, but he doesn't know where it is.
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| Season 9
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| File:Séance Shméance 196.png
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187b
|
"Séance Shméance" (tr • ga)
|
Supporting; He comes to the Krusty Krab to order a Rusty on Rye, and when he is about to leave angrily when he realizes his order is not in the menu, SpongeBob jumps in front of him and asks him what a Rusty on Rye looks like, and Jenkins explains him. After a crazy spirit night, SpongeBob makes a Rusty on Rye for Old Man Jenkins and he eats it happily.
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| Season 11
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| File:The Check-Up 095.png
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217b
|
"The Check-Up" (tr • ga)
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Cameo (non-speaking); He makes a brief cameo in a portrait when SpongeBob and Squidward (in disguise) take Mr. Krabs inside an X-ray machine (which is decorated to look like a photo booth).
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| File:High Sea Diving 131.png
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230a
|
"High Sea Diving" (tr • ga)
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Major; His first major role in an episode. He is seen when he accidentally floated up into the Great Pacific garbage patch above Bikini Bottom on his birthday. He eventually met up with SpongeBob who was attempting to perform the high sea diving stunt and claims himself to be King Neptune. SpongeBob then made a ladder to help get Jenkins back down to Bikini Bottom, which also cleaned the ocean's surface. Once Jenkins was brought back down, the real King Neptune appears and burns him to a crisp as punishment for tricking the town with his made-up stories.
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| File:Plankton Paranoia 178.png
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235a
|
"Plankton Paranoia" (tr • ga)
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Cameo; On the end of the episode, he is seen at the Chum Bucket on Mr. Krabs' surprise party.
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| File:Appointment TV 200.png
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238a
|
"Appointment TV" (tr • ga)
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Minor; At the end of the episode, he yells at the gang for using his amphitheater. Sandy and the gang run away except SpongeBob. Old Man Jenkins reveals he wanted to be in the play, so he and SpongeBob decide to play Mermaid Man. SpongeBob asks him if he would want to be Mermaid Man and he agrees. He puts on the mask and flies away as the episode ends.
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| File:Karen's Virus 158.png
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238b
|
"Karen's Virus" (tr • ga)
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Cameo (non-speaking); He is seen dancing at Wagon Wheel dressed like Walter Haddock alongside other hillbillies.
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| Season 12
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| File:FarmerBob 039.png
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242a
|
"FarmerBob" (tr • ga)
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Major; He is a major character in this episode. Mr. Krabs takes SpongeBob to his farm in order to pay off their bills.
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| File:The Ballad of Filthy Muck 089.png
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243b
|
"The Ballad of Filthy Muck" (tr • ga)
|
Supporting; Old Man Jenkins appears throughout the episode. He insists that he is not afraid of Filthy Muck because he has lost his ability to smell.
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| File:Senior Discount 041.png
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251b
|
"Senior Discount" (tr • ga)
|
Major; Old Man Jenkins is revealed to have annoying habits that drive other customers out of the Krusty Krab, so for that reason, Mr. Krabs tries to get him out of the restaurant.
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| File:The Ghost of Plankton 179.png
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259a
|
"The Ghost of Plankton" (tr • ga)
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Cameo; Old Man Jenkins appears at the very end of the episode in Plankton's "funeral."
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| File:Hiccup Plague 101.png
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261b
|
"Hiccup Plague" (tr • ga)
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Minor; He is seen mocking Bubble Bass for complaining about his hiccups, saying that back in his day, hiccups could turn people inside out.
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| Season 13
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| File:A Place for Pets 039.png
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268a
|
"A Place for Pets" (tr • ga)
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Minor; He is seen at the beginning of the episode eating at the Krusty Krab with his pet worm hog that strongly resembles Mrs. Wormsley.
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| File:The Goobfather 059.png
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291b
|
"The Goobfather" (tr • ga)
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Minor; He and Old Man Walker were hired by Mr. Krabs to take out the Goofy Goober goons.
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| Season 14
|
| File:BassWard 103.png
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296a
|
"BassWard" (tr • ga)
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Supporting; he gives Squidward and Bubble Bass a ride to Jetsam City.
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| File:Momageddon 057.png
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298a
|
"Momageddon" (tr • ga)
|
Minor; he is impatient for his order until Margaret SquarePants comes out and serves it. Since it is different than usual, he hesitates and only eats it because of how hungry he is. Once he tries it, he ends up liking it because it reminds him of his own mother's cooking.
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| File:Snow Yellow and the Seven Jellies 179.png
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304
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"Snow Yellow" (tr • ga)
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Minor; he is one of the seven jellies.
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