During a rare eclipse of the moon, a baby ghosts slips through a dimensional crack and becomes lost in New York. The Ghostbusters adopt the cute ghost, but soon hear reports of two other ghosts causing trouble around town.

An incredibly powerful evil animal demon escapes from his statue prison and turns the animals of New York City into fierce, aggressive, talking beasts that proceed to take over the city.

During a freak accident, Egon's mind and Slimer's mind are exchanged hours before Egon is due to enter a test of mental power with the ghostly Master of Shadows. Can Egon reverse the process, even as his personality deteriorates into a quest for food?

After a near-death experience atop the World Trade Center towers, Egon's fear inadvertently releases the Boogieman from his dimensional prison. The Ghostbusters follow him to a hideously converted amusement park, where he traps them with their own fear, leaving Slimer and the Junior Ghostbusters to save the day.

Not wanting to return his favorite fairy-tale book to the library, Slimer hides it in Egon's latest invention and accidentally turns it on. The next day the fairy tales have come to life, and the fantastical beings learn that Egon's machine was designed to turn ethereal entities into solid matter!

A wisp of ectoplasmic energy seeps out from the Containment Unit and merges with Slimer, turning him into a huge monstrously hungry ghosts. Can the Ghostbusters separate Slimer from this malevolent force before he is unable to return to normal?

A local children's hospital needs $50,000 to remain operational so the Ghostbusters make a deal to use the Stay Puft Marshmallow Man in a commercial for that amount of money. Unfortunately, when Stay Puft emerges, so does the nasty Phantom, who begins to create havoc.

As a Halloween party takes place in the firehouse, two goblins sneak in unnoticed and release Samhain from the Containment Unit. The spirit of Halloween immediately sets up his headquarters in the firehouse and captures the Junior Ghostbusters.

A ghost is pestering the Micawbs, a family stranger than many of the busted spirits now residing in the Containment Unit. However this case proves incredibly tough for the Ghostbusters as they are kept busy sorting the weird from the paranormal!

A young boy asks the Ghostbusters about a strange creature he has seen talking to his brother. Egon soon realizes that the boy described a Grundel, a creature who appears to young kids and turns them bad, until they become Grundels themselves.

Walter Peck is back and out to discredit the Ghostbusters any way he can. When his efforts to expose them as frauds fail, he hits them where it hurts by taking Slimer away for government testing. Will Slimer be sent to oblivion?

The Ghostbusters are plagued at the firehouse by a metamorph dubbed Copycat. It changes its shape to match anything, and soon there is much animosity amongst the team, as each blames the other for an act of malice!

The Ghostbusters head off to the woods for a camping vacation. That night, Ray scares the wits out of everyone with a spooky ghost story which inadvertently reveals a Bigfoot nearby!