A convention centre called "Plump Towers" is opening up, and the owner, J. Portman Plump, announces the first users: a convention of dentists in costumes. Mayor Lenny then notes that there's also a second convention called Deadcon 1, which Plump supposes are undertakers. However, when they show up, they turn out to be ghosts instead.
The Ghostbusters are called to Plump Towers, but then they mistake one of the dentists for a ghost due to his costume and nearly miss him. Plump tells the Ghostbusters off and confiscates their proton packs, but tells him to get rid of the ghosts without them. Thus, the Ghostbusters go undercover — Ray at the front desk, Egon as the bellhop, Winston as the phone operator, and Peter working room service. They all get bonked around a bit, but none get seriously hurt or endangered, nor do they find any useful information.
The Ghostbusters then learn that Deadcon 1's opening banquet will happen at the same time as the dentists' masquerade ball. Then, they start making food in the kitchen. Plump enters and reveals that Deadcon 1 ordered a lot of hot chocolate, and then the Stay Puft Marshmallow Man enters with Janine revealing that she released him because Ray told her to do whatever the Deadcon ghosts say, and that they want him as their keynote speaker.
As Stay Puft practices his speech, Peter and Ray eavesdrop on the Deadcon ghosts, who talk about executing Doomsday. The Ghostbusters all run to get their proton packs back, while the Deadcon ghosts kidnap Plump and join the dentists' ball. The Ghostbusters then start trapping the ghosts, but get surrounded. Peter starts a conga line, then traps most of the rest of them, then he and Egon trap the ghosts who kidnapped Plump, with Ray rescuing Plump. He thanks them, and they drive off, belatedly realising they forgot to trap Stay Puft.
This episode provides examples of
- Amazing Technicolor Wildlife: One dentist wears a pink bunny suit.
- Anthropomorphic Food: The Stay Puft Marshmallow Man appears again.
- Big "WHAT?!": When Plump mentions the hot chocolate, the Ghostbusters shout, "WHAT?!".
- Conforming OOC Moment: Egon joins in on the Mass "Oh, Crap!" when the Ghostbusters are surrounded.
- Covered in Gunge: One ghost spits Peter out, leaving him drenched in its spit.
- Dem Bones: One ghost resembles a walking skeleton.
- Eat the Camera: When the ghosts show up, one man screams and we get a closeup of his throat.
- Losing Your Head: Justified — one ghost can walk around with his head detached, but he's undead.
- Mass "Oh, Crap!": The Ghostbusters look scared when the Deadcon ghosts surround them.
- Meaningful Name: Plump is a little chubby.
- Mistaken for Undead: Plump confiscates the Ghostbusters' proton packs because they mistook a dentist in a white robe for a ghost.
- Names to Run Away from Really Fast: The ghost convention is called Deadcon.
- Neat Freak: What convinces Plump to let the Ghostbusters trap the Deadcon ghosts was them messing up the carpets.
- Noodle Implements: Stay Puft tells a joke about 'the farmer's daughter's wheelbarrow'.
- The Prankster: One of the dentists, Fred, likes to prank people with joy buzzers.
- Red Eyes, Take Warning: A few of the ghosts have read eyes.
- Skewed Priorities: The Ghostbusters convince Plump to let them trap the ghosts, not because they might take over the world, but because they might mess up his carpets.
- Speak in Unison:
- The Ghostbusters yell, "WHAT?!" in unison when Plump mentions the Deadcon ghosts ordered gallons of hot chocolate.
- Later, the ghosts chant, "Doomsday! Doomsday!" in unison.
- Take Over the World: It's implied that after the ghosts wreak havoc on the world, they were planning to rule it.
- This Is Gonna Suck: Upon meeting the giant, spooky head, Peter just says, "Oh, brother!".
