Egon and Janine stumble across a carnival with a roller coaster called the Ecto-1. Egon is less than pleased with the trademark infringement, but when the ride is taken over by actual ghosts, the ride's owner capitalizes on the event for publicity.

Peter's father stumbles upon a strange artifact in the Artic; a block of black ice containing a fire demon that was captured ages ago. Unfortunately, he and phony psychic Doctor Bassingame later unleash the demon into New York City!

An unkind dying billionaire has a machine built to send his money and possessions to the other side, so that he'll have it after he dies. Unfortunately, the machine releases horrendous ghosts in exchange.

Peter's con man father arrives in New York, peddling phony ghost-repellent ponchos. Meanwhile, a seafaring expedition disappears at sea in the New Jersey Parallelogram. To save the ship – and Peter's father – the Ghostbusters enter a very weird and dangerous dimension.

Samhain's goblins release the spirit of Halloween from the Ecto-Containment Unit, and he turns the firehouse into his fortress. The Ghostbusters' attempts to take him down are foiled when the Junior Ghostbusters are captured by the vengeful spirit, and it's up to Slimer to help get them out.

A large, inflatable balloon of Murray the Mantis becomes possessed during the balloon's appearance in a prominent New York parade. Overwhelmed, the Ghostbusters release the Stay Puft Marshmallow Man from the Containment Unit and a mighty battle begins.

Ray's Aunt Lois invites the Ghostbusters to a séance conducted by phony spiritualist Dr. Bassingame... but aunt Lois is soon trapped by angry spirits.

Ray stands to inherit an old castle in Scotland on the condition that he exorcises the ghost that has plagued it for many years. But when he captures the spirit, an army of battling specters rise to cause massive destruction.

Marduk, the Babylonian God of the Cities, has come to live in New York, the ultimate city in the world. But his age-old enemy has followed him, intent on mass destruction!

After New York appears to suffer an earthquake, the ever enthusiastic Ray heads off into the sewers by himself to find out more. There, he learns that ghosts are gathering for a massive attack on the city!

A large horde of demons invades the city looking for a pair of scissors once owned by the mythical Three Fates. Now, the Ghostbusters find themselves in the depths of the netherworld, racing to stop the demons from controlling the lifespans of all mankind.

Peter creates a Ghost Attractor which lures ghosts to the firehouse like a magnet. He believes that it will not only save the Ghostbusters a lot of legwork, but that it will also make them millionaires. Things don't go as planned.

The Ghostmaster general, tired of the Ghostbusters' constant interference, sends three ghostly bounty hunters to eliminate the heroes at the firehouse. In the ensuing battle the Ghostbustesr are reduced to six inches in height!

At an excavation site in Brooklyn, workers accidentally uncover a dimensional gateway to the world where all lost objects go. The Ghostbusters are called in to help plug the ever-widening chasm and discover that the company is run by someone very close to Winston.

A bad lookalike of Slimer on the run arrives in the firehouse via a mirror and sends Louis and the real Slimer to the Ghost World.

Slimer wins the lottery, only to find his winnings have been cursed.

A year after the Ghostbusters defeated Vigo the Carpathian, a ghost named Poso kidnaps Janine and Louis to force the Ghostbusters to hand over their business. The Ghostbusters get help from a recently-captured ghost, Shifter, to find out why Poso wants their business and where to find him. Covered in mood slime, Peter goes to the Ghost Town to save Louis and Janine.

Slimer finds a cat that can make all of his dreams come true.

The Ghostmaster is back and casts a spell on the Ghostbusters that causes all electronic equipment near them to shut off, including their proton packs and ghost traps.

The Ghostbusters get a new TV as payment for a job. When Ray stays up to watch television, he sees into the Ghostbusters' future. The others don't believe him at first, but Ray is quickly proved right and the next vision shows them their deaths.

The sinister Professor Dweeb captures Slimer by posing as an innocent ice cream vendor. By using his new invention, Dweeb intends to read Slimer's mind and discover a ghost's vulnerability. Helplessly trapped, Slimer can only watch as the evil Professor scans through his memories.

Slimer has been pestering they guys too much and they finally snap at him. He sulks off to the attic, just as the Ghostbusters are called out on a mission. When a powerful ghost heads for the firehouse to destroy it, a despondent Slimer is the last line of defense!