Ghostbusters Week!! - The Real Ghostbusters Promo

We all know there was a pretty famous Ghostbusters cartoon in-between both movies.
What not all of us know is that it evolved a lot through production, from it not being called The Real Ghostbusters (name changed due to another cartoon using that name already) through it various iteration's tone being more simplistic/funnier or even darker/more serious.

This promo which was tested with audiences before the cartoon production had a tone a tad bit darker/more realistic (note the costumes closer to the ones in the movies unlike in the actual cartoon) and the Ghosts design being closer to the movies. (even Slimer doesn't look like the cute mascot he ended up being):



Most of the scenes here ended up in the cartoon's opening introduction.