The Ghostbusters are chasing a very quick ghost. They chase him into a chemistry lab, but Peter accidentally fires at a vat of pink stuff. This ends up causing a lot of spills and explosions, but the Ghostbusters survive unscathed and trap the ghost. Egon and Ray note the oddity at the ghost being registered as a Class 2 despite previously showing up as a Class 3, then the scientists tell the Ghostbusters off for the damage they did. However, Peter brushes them off, saying the owner gave them permission.
Later, the Ghostbusters take showers to get the gunk off them, but they still feel bad, and Egon's arm begins swelling and pulsing. Janine later goes back to work after going shopping, only to find Slimer acting nervous and claiming not to be hungry. She enters the dining room, to find all four Ghostbusters once again covered in pink gunk, which they reveal is growing on their bodies and through their clothes. Ray reveals that he called the chemistry lab, but they can't identify the substance as all their chemicals mixed together in the explosion, so the Ghostbusters go to the hospital.
The doctors think the Ghostbusters are fine, but they can't be certain, so they keep them in beds and study them. Janine comes over with food for Egon and Ray and books for Winston, but then Ray reveals he's grown an eye on his chest. The doctors examine Ray, but find no cause for the eye, and Janine confronts one doctor and he reveals that it may take five or six years to treat the Ghostbusters.
Later, the doctor gives the non-Egon Ghostbusters, now in wheelchairs, injections, but they grow sick of it and chase him with a giant syringe. Janine and Slimer later meet up with Ray, who the doctors have been zapping with electricity, and the doctor tells Janine to take Slimer away. Then, some goop flies off Ray's hand and towards Slimer, only to fly back onto Ray when Slimer leaves.
Meanwhile, the Ghostbusters are grossing everyone out, and Peter has grown an ear on his chest, Winston a mouth, and Egon a nose. Egon determines that they could get rid of the goop by zapping it, but they'd have to get it off them first. The substance then starts moving and they note that it seems to be responding to Slimer.
They ask Janine to let him into the hallway, and she reluctantly does, so the slime jumps off the Ghostbusters and coalesces into a creature. The creature chases Slimer, intent on eating him, but the Ghostbusters grab their proton packs and fire at him until he explodes (they need to do this as he's not a ghost and thus can't be trapped). A week later, the Ghostbusters are allowed to go home, but are given a medical fee. However, it's the same as the bill they charge for their services, so no one ends up paying anything.
This episode provides examples of
- Body Horror: Egon's arm swells unnaturally, and then all the Ghostbusters end up with thick, pink goop growing all over their bodies and body parts on their chests.
- Covered in Gunge: The Ghostbusters end up swimming in the pink goo and covered in it from about their solar plexuses down. Later, they end up with pink goo growing all over their bodies.
- Cyclops: The goop creature has one eye.
- Delirious Misidentification: When Ray is loopy from the doctors' zapping him, he mistakes Janine for his mother.
- Distressed Dude: Slimer ends up being chased by the hungry monster.
- Dork in a Sweater: One of the scientists wears a sweater vest.
- Evil Laugh: The ghost laughs evilly upon seeing the mess.
- Eyes Do Not Belong There: Ray grows an eye on his chest.
- Giant Medical Syringe: The Ghostbusters (except Egon) chase the doctor with a huge syringe as payback for all the injections.
- Hypocritical Humour: Egon berates Peter for taking pleasure in the "trivial" act of reminding people they have permission to go where they please on a job... but then says it's his turn.
- Labcoat of Science and Medicine: The scientists in the lab, and the doctors, wear lab coats.
- Mass "Oh, Crap!": The Ghostbusters all look serious and scared when the vat Peter shot lights up.
- Not-So-Innocent Whistle: Peter whistles when trying to hide that he forgot to pay the insurance bill.
- Oh, Crap!:
- When the doctors reveal that they don't know what's wrong with the Ghostbusters, Ray says nervously, "We're doomed!".
- Slimer looks scared upon hearing that the goop creature will probably want to eat him.
- One-Liner: When the gunk starts growing on the Ghostbusters, Peter says, "I thought you waited 'til after we've eaten to scream, Janine", Ray says, "How do you like our new look?" and Winston says, "I thought these skin problems were supposed to end in high school".
- O.O.C. Is Serious Business: When Slimer isn't hungry, Janine says, "You're not hungry?! YOU!?".
- Plot Allergy: Discussed when Egon notes that having a giant nose on his chest would be even worse during hay fever season.
- Saying Sound Effects Out Loud: When the doctor asks the Ghostbusters to cough twice, everyone does, except Egon, who just says, "Cough. Cough."
- Shout-Out:
- Peter, when urging himself to run faster, says, "I think I can", which is what the train says in The Little Engine Who Could.
- At one point, Peter calls Ray "Captain Ahab", who's the protagonist of Moby-Dick.
- Smart People Wear Glasses: In addition to Egon, the eldest of the scientists wears glasses.
- Sophisticated as Hell: Egon says, "For a simple class three apparition, he's sure got a lot of spunk."
- Soup Is Medicine: Downplayed — Janine gives the "sick" Egon chicken soup, but she also states that it's his favourite food anyway.
- Sticky Situation: The gooey Ray gets a mug stuck to his hand.
- Tears of Fear: Slimer cries fearfully when being chased by the slime monster.
- Theme Music Power-Up: The theme song plays in the background when the Ghostbusters are blowing up the slime creature.
- This Is Gonna Suck: Upon noticing his arm is swelling excessively, Egon says in a slightly worried, but still stoic, tone, "I think I know why [we feel bad]."
- Too Unhappy to Be Hungry: Slimer is too scared to eat the food Janine offers him.
- Unwitting Instigator of Doom: Peter inadvertently starts the trouble by accidentally firing at a vat of goop.
- Your Favorite: Janine knows what Egon's favourite food is (chicken soup) supposedly due to her crush on him.
