It is a golden house with two floors. It has at least four windows and a door. The door and windows resemble the ones on SpongeBob's house. The roof of the house is white and double-paneled. It has a dark gray metal chimney.
On the left and right of the door, there are two plants. In front of the door, there is a "welcome" mat.
The living room has green wallpaper with a floral pattern on it. There is a picture of SpongeBob and unknown fish. The floor is carpeted and red. There are also a set of stairs.
On the left side of the stairs, there is a cabinet with a clock at the top. On the right of the stairs, there is an armchair with a pillow on it and a stool in front of it. On the right of the armchair, there is a lamp with a light green base and an orange lamp shade and a picture on top of a barrel. On the right of the lamp, there is a light green couch with a pillow on it.
Above the couch, there is an image of the sun coming up or down in the background and in the foreground, there are rocks in some water or goo. In front of the couch, there is a glass coffee table.
In front of the coffee table, there is a TV. To the right of the couch, there is a lamp and barrel that looks like the one that is located to the left of the couch. Next to the lamp that is located to the right of the couch, there is a window with yellow curtains.
Role in series
SpongeBob gets a letter from his eponymous cousin. It says that he is out of prison and has decided to pay Harold and Margaret a visit. It also says that if SpongeBob wants to see them again, he needs to have a wrestling match at their house. SpongeBob gets nervous because when he was a kid, BlackJack would beat him up.
SpongeBob decides that he needs to save his parents, so he runs to the house. It has police tape around it and the whole house is covered with plastic. SpongeBob thinks that a crime has occurred. He forces his way in and notices that several pieces of furniture in the living room are covered in plastic. He continues walking until he notices a broken picture of him and his parents. SpongeBob imagines that his parents are having a peaceful night watching TV, when BlackJack bursts in and kidnaps them.
SpongeBob then finds a cabinet that also has plastic on it. Inside, there is a note that says BlackJack has visited Grandma SquarePants' house.
Towards the end of the episode, SpongeBob finds his parents at BlackJack's house. They are putting up decorations for a party. They reveal that the broken image was just Margaret accidentally dropping it and the house was covered in plastic because it was being fumigated for krill.