 The original premise of "Ghostbusters" had three main characters:  John Belushi (qv), Dan Aykroyd (qv) and Eddie Murphy (I) (qv).  They fought ghosts in SWAT like suits using wands instead of guns.  The ghost named Slimer was known as "Onionhead", and at the end of  the movie the Ghostbusters franchise was all over the United States.  John Candy (qv) also was slated to play Louis. However, with  Belushis death and characters backing out, the script was rewritten  and new actors casted.