Richard and Nicole are asleep in bed when Richard hears a low moaning sound coming from the attic. He assumes that it is a ghost and gets very scared, prompting Nicole to turn on a musical baby lamp which Richard finds very relaxing and falls asleep.
The next morning, Nicole finds Richard in the cupboard hiding from the ghost while getting another box of cereal for Gumball, who is pouring it down his pants. Anais and Darwin question why he is pouring the cereal in his pants and he leads them both up to the attic.
Gumball reveals that he has been keeping Mr. Robinson in the attic ever since he found him in the shed. For some reason, Mr. Robinson has not said a word or moved a muscle since he found him, so Gumball decides to give Mr. Robinson a comedy show starring himself. It fails, and after a routine, Mr. Robinson gets up and looks out the window to see his wife getting the mail. She glares at him and walks away muttering something angrily.
Obviously upset, Mr. Robinson begins to yell "Why?!" causing Richard's hot dog to splat on to the ceiling. Richard thinks the poltergeist ruined his sausage. Gumball shows him a picture of a cat playing a kazoo but this still has no effect on him. Gumball finds a box containing "Electro Fat," which is apparently an exercise aid that electrocutes the user into getting into shape. He hooks up Mr. Robinson to the aid and turns it on, which causes him to be electrocuted. They crank the power up to its highest setting which shorts the house's electricity out.
Inside, Nicole accidentally triggers a trap that Richard had set for the ghost. The trap hangs her upside down while the power is still out, making Richard think that the ghost is making her levitate when the lights come back.
Gumball and Darwin are observing the severely electrocuted Mr. Robinson and compare him to a bulldog staring at the sun. Seeing Mr. Robinson upset reminds them of the last time they saw him happy, which was when Darwin's head was being squished in between the automatic doors of Food 'n' Stuff. Remembering this, they conclude that Mr. Robinson is more partial to physical comedy and not stand-up. They then try it, to no avail.
Back in the house, Nicole is still hanging upside down. Richard begins to hysterically argue with Nicole about the ghost situation, causing Mr. Robinson to curiously peek at them. Feeling emotionally triggered by the sight of Nicole and Richard arguing, he explains that he lost his spark, which is his anger, forcing his wife to kick him out. As he has a short flashback to all the times and places he and Margaret argued, Gumball figures out that what was missing in Mr. Robinson's life was his anger, which is what made the Robinsons love each other.
Gumball decides to lower Mr. Robinson down out of the window to get him outside without his parents noticing, the plan works, but Mr. Robinson still falls onto the Wattersons' lawn. Outside, Mr. Robinson sees his wife watering and then beheading flowers. The boys encourage Mr. Robinson to have an argument with his wife, but he claims to not be that man anymore. Gumball and Darwin then attempt to use Mr. Robinson like a puppet and pretend to make him be angry, but Margaret sees through their trick, causing Mr. Robinson to get depressed again and start crying under the sheet.
Just then, Richard comes out of the house with the vacuum cleaner in hand and charges at Mr. Robinson, assuming that he is the ghost and was about to attack his sons. After Richard violently smashes him with the vacuum cleaner a couple of times, Gumball accidentally whacking him with a rake while protecting him from his dad, and Mrs. Robinson throwing his suitcase on him, Mr. Robinson snaps with the pressure of the day's previous events and his anger returns.
In his fit of rage, he attempts to destroy the Wattersons' backyard but miserably fails. However, seeing her husband back to his old grouchy self reignites the spark in their marriage as Mr. Robinson throws open the gate and snuggles his wife lovingly. After rejecting Gumball and Darwin's proposal to be friends now, the Robinsons leave.
Richard is feeling insulted by Mr. Robinson, who called his house, lawn chairs, and his clip-on tie ugly and tacky, so Gumball shows him a strange picture of a cross-eyed gopher lifting a dumbbell. This somehow cheers him up as he states that even though the Robinsons have nicer stuff than he does, he knows how to treat his wife. Contrarily, Nicole is seen alone in the house, biting through the ropes. She manages to free herself but is again caught in another trap, she yells to Richard angrily and the episode ends.
Gumball's picture of a bulldog is signed by Mic Graves.
Due to the fact that in some countries there is no translation for Poltergeist, in some countries the episode received an adaptation, and the title is translated to "The Ghost," thus making this the only episode to have a re-used name.
The way Mr. Robinson describes his and Margaret's arguing could be alluding to something done in the bedroom, as it is described in the same way. (In the backyard, in the car, in public, up to six times a day)
This episode marks the second time that Mr. Robinson has a major role. The first time was in "The Debt."
This episode appears to take place after "The Car," as Richard's Electro Fat is stored away in the attic.
For some reason, the window on the roof in front of the house is a part of the attic instead of Gumball and Darwin's room as it was in previous episodes.
Mrs. Robinson is seen with a genuine smile in this episode, which is the first time this has happened.
All of Gumball's six whiskers can be seen for the third time, after "The Pressure" and "The Ghost." They can be seen when Gumball impersonates a pea on a fork.
Gumball's picture of a hamster holding up a barbell are later seen again in the episodes "The Signature," and "The Web."
Richard wearing the vacuum cleaner on his back is a reference to the proton packs from the movie Ghostbusters. It could also be a reference to Luigi's Mansion, in which Luigi must defeat ghosts with a special vacuum called the Poltergust 3000.
In the beginning of the episode, the nightlight Nicole uses to calm Richard down plays the song "Toreador March."
When Mr. Robinson is remembering everything that happened to him, he cracks the lenses on his glasses. But when he says "Your tacky lifestyle!" his glasses' lenses are not cracked.
When Mrs. Robinson shuts the mailbox, the lid does not move.
When Nicole is hung upside down, her skirt is not affected by the gravity.
At the start of the episode Gumball puts the cereal "Daisy Flakes" down his pants but they are never seen nor mentioned for the rest of the episode.
In Darwin's flashback, the white circles of his shoes are missing. Also, in the same scene, there is a reflection of a disabled sign in the glass but it is facing towards the mall, not the parking lot.
Despite the fact that Nicole says that there are no such things as ghosts, Carrie is one.
This could be because she has not met Carrie yet.
When Darwin is being pushed by the electric doors, the reflections on the doors move with them.
When Nicole says "Richard, by all means, be hysterical. But don't forget to breathe!" her sleeves are missing.
When Mr. Robinson looks out of the window in the attic, it is revealed that the uppermost window of the house as viewed in the outside is for the attic window, as opposed to the episodes "The Responsible," and "The Gi," where the window was for Darwin and Gumball's room.
In the cinema, Betty is missing her body and legs. Only her arms and face are shown.
Latinoamericano español (Latin-American Spanish): El Fantasma (The Ghost/Poltergeist)
Español en españa/Castellano (Spanish in Spain): El Poltergeist (The Poltergeist)
Français (French): L'esprit (The Spirit)
Italiano (Italian): Caccia al fantasma (Ghost Hunt), Il Fantasma (The Ghost)
Magyar (Hungarian): Kis sértett-járás (wordplay, cannot be translated)
Polski (Polish): Duch (The Ghost)
Türkçe (Turkish): Afacan Peri (Naughty Fairy)
Português (Portuguese): O Fantasma (The Ghost/Poltergeist)
Japanese: ミスター・ロビンソンの苦悩/Pak Robinson suda (Mr. Robinson's anguish)
Български (Bulgarian): Полтъргайстът (The Poltergeist)
عربية (Arabic): الصدمة (The Shock)
Tiếng Việt (Vietnamese): Hồn Ma (The Ghost/Poltergeist)