He wasn't a ghost. He was a giant Stay-Puff Marshmallow Man. He was made of marshmallow.
The scientific theory in Ghostbusters is that the cohesive part of a spirit is an ectoplasmic residue, which is left behind in our realm if it comes into contact with a ghost. This has been discovered in a few paranormal investigations, but there is no scientific proof that the ectoplasm came from an incorporeal entity. Ghostbusters would not be a funny movie unless there was a common occurance of being attacked by a ghost... like that of Peter Venkman getting "slimed" from head to toe in green goo.
They wouldn't fight because they're both good guys. But, if they did fight, then it would probably depend on when they were plucked from their respective franchises. Danny at the end of the show could easily beat the Ghostbusters from the very beginning of the first movie, but the Ghostbusters from the end of their franchise could beat episode 1 Danny.
His name is Slimer. Although I don't think he had a name in the actual Ghostbusters movies. I think he was only given a name in the cartoon TV show that was on in the late 1980s to early 1990s.
Mick Smiley - Magic
There the guns from Ghostbusters. Remember?
ghostbusters!
I ain't afraid of no ghost!
Call ghostbusters
GhostBusters
This isn't Ghostbusters. They can't be captured.
In my opinion, it is Ghostbusters!
Pick up the phone and call Ghostbusters
Ghostbusters - 1986 The Ghost of Don Quixote 1-46 was released on: USA: 10 November 1986
Extreme Ghostbusters - 1997 Ghost Apocalyptic Future - 1.18 was released on: USA: 1 October 1997
Sheet music.
No, John Malkovich is not in Ghostbusters.