After saving the world -twice, now- from certain doom, the Ghostbusters intend to take a rest, as much as they can, at least. But then something they've never seen before comes into their lives, and a new adventure begins for all involved as they take on a new recruit!
Crossover with Ghostbusters: The Video Game
Takes place after the second movie
Also, a shoutout to NightSaber on Deviantart for the image.