Season 1
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5b
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"Home Sweet Pineapple" (tr • ga)
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Supporting; comes to pick up his son SpongeBob after Nematodes eat his house.
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10a
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"Culture Shock" (tr • ga)
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Minor; seen watching the Krusty Krab talent show.
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Season 2
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30a
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"No Free Rides" (tr • ga)
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Minor; gives SpongeBob a boat-mobile for passing his driver's test.
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Season 4
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77a
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"Driven to Tears" (tr • ga)
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Minor; Patrick thinks that Harold and Margaret are his parents only to be remained that their SpongeBob's parent not his.
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Season 5
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85a
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"New Digs" (tr • ga)
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Minor; Harold and Margaret come to visit SpongeBob.
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89b
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"Sing a Song of Patrick" (tr • ga)
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Portrait cameo; in their picture, Harold and Margaret get annoyed after listening to Twinkle, Twinkle, Patrick Star and Margaret turns the picture.
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93c
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"BlackJack" (tr • ga)
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Supporting; Harold and Margaret go to celebrate their nephew BlackJack release from prison.
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Season 6
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110a
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"The Slumber Party" (tr • ga)
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Portrait cameo; Mr. Krabs throws the portrait of Harold, Margaret, and an infant SpongeBob.
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123-124
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"Truth or Square" (tr • ga)
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Minor; seen in a flashback where questions if he and his pregnant wife should at the Krusty Krab.
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Season 7
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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; Squidward mentions that SpongeBob's mother and father sent him a postcard.
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Season 8
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159
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"A SquarePants Family Vacation" (tr • ga)
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Major; goes on vacation with his wife, SpongeBob, and Patrick.
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Season 9
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196a
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"The Fish Bowl" (tr • ga)
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Portrait cameo; Sandy places a camera on their portrait.
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Season 11
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217b
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"The Check-Up" (tr • ga)
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Portrait cameo
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223b
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"Bunny Hunt" (tr • ga)
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Portrait cameo
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Season 12
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254-255
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"SpongeBob's Big Birthday Blowout" (tr • ga)
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Supporting; he and his wife attend SpongeBob's birthday party.
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Season 13
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280b
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"Wallhalla" (tr • ga)
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Portrait cameo; Harold gets annoyed when SpongeBob gets stick by his walls.
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283a
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"Ma and Pa's Big Hurrah" (tr • ga)
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Major; Harold and Margaret move in with SpongeBob.
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Season 14
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298a
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"Momageddon" (tr • ga)
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Minor; he is seen at the Krusty Krab for Dad Day.
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