During Thanksgiving parade, a balloon of a cartoon character called Murray the Mantis mysteriously turns into a living giant preying-mantis. Why did this happen? Simple, the guys who filled up the balloon, filled it up in a warehouse which used to be a morgue. When Venkman tries to blow it up, by using his proton pack, things go from bad to worse. The Ghostbusters try to destroy it, but unfortunately the creature is too strong to be captured, they need to call in reinforcements... and the only creature big enough for the job is but an old acquaintance of the boys who carry the proton packs, the Stay Puft Marshmallow Man!
With his help, would they be able to save the city and the Thanksgiving parade? Awesome episode, and one of the best ever!