The Extreme Ghostbusters

Plot
Five Years after Ghostbusters IV, Egon, Ray, Peter, and Winston have gone their separate ways in life retiring as Ghostbusters, but Eddie Kong Jr., Jake Spencer Jr., Tracey The Gorilla, Eric, Spike, and Ziggie are The Extreme Ghostbusters.

The Extreme Ghostbusters still hunt leftover supernatural forces Worldwide, Timewide, and Galactic Wide, making sure to stop any evil ghosts.

Egon from Earth-16 B, appears comfronts of The Extreme Ghostbusters asking them to come to alternative Earth to stop the world which infested by and ruled by Other Worldy Ghosts.

So its up to The Extreme Ghostbusters and Egon (Earth-16 B) to stop the world infested by Ghosts.

Sequels
The Extreme Ghostbusters II

The Extreme Ghostbusters III

The Extreme Ghostbusters IV

Crossovers
The Extreme Ghostbusters vs. The Real Ghostbusters