The Real Ghostbusters was a toy line (and cartoon series) made by Kenner that was based on the original "Ghostbuster" films. There was another separate and non-related cartoon series around that time by the name of "Filmation's Ghostbusters" which also had a few toys.
Kenner's Real Ghostbusters featured various figures based on the heroic four: Ray Stanz, Egon Spengler, Winston Zeddmore, and Peter Venkman. There were also toys made of various ghosts (including Slimer!) and an Ecto-1 vehicle. The series went "Extreme" when the toy line started to falter when new characters and more dynamic poses were introduced (the line failed shortly afterwards and ceased to exist).