When Kylie was a child, a friend of her's mysteriously disappeared. Now, a ghost who looks like him has turned up. To stop and save him, Kylie calls upon a ghost the Real Ghostbusters captured years ago: the Grundel. Now the EGB has to deal with two ghosts and one is out for revenge.
Slimer gets trapped in the containment unit (and Peter Venkman isn't even here to see it), surrounded by some very vindictive ghosts that remember him, including a demon named Surt who wants to bring about Ragnarok. Eduardo goes in to save Slimer, while the rest of the EGB has to bust a demon hound in the Firehouse.
The EGB have to join forces with a vengeful ghost to stop a ghost whale's rampage. Niether of them fully trust one another, which leads to much controversy. But in the end they pull together and stop the ghost.
A ghost starts taking over people's bodies by pulling their souls into a mirror. When the others get trapped, it falls to Kylie to save the day. With the help of Slimer she goes into the mirror to save the day, but the ghost has other plans.
The EGB find their equipment useless against a radioactive energy eating ghost. The team feel helpless for the first time, until Egon figures out a way to counter act the radioactive energy and helps them take down the ghost.
A recently released Leprechaun is trapping people in his pot of gold and Mayor McShane is his next target. The EGB attempt to stop him but in doing so end up in his pot. Now it is up to Egon to find a way to get everyone out of the pot of gold.
After a Chinatown merchant disappears, the EGB find the merchant has fallen prey to a bone stealing demon. Egon then develops protective suits for the EGB and along with Slimer they go out and search for the demon.
A Demon seed inhabits a Professor's plant, and takes over the building. The plant is destroyed, and the demon takes on another plant, in the park. Kylie thinks this demon is a helpful Amazon Plant, however she is wrong. It's really a civilization destroying demon inhabiting a seed. Can the EGB's stop Kylie before she has a chance to freeze it and send it back to the Amazon?
Kylie gets transported to a future where a ghost named Tempus rules over humanity. While she meets a group of resistance fighters, the others have to prevent Tempus' take over in the present.
The weather in New York City is made a lot worse when a spirit called the Harasvelg arrives. First the EGB try to stop the weather from changing, but when that fails they go straight to the source.
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