Prod. No.:
TSHIRT_2210 Officially Licensed Ghostbusters Merchandise
Ghostbusters Glow In The Dark Logo T-Shirt
Ghostbusters concept was inspired by Aykroyd's own fascination with the paranormal, and it was conceived by Aykroyd as a vehicle for himself and friend John Belushi.
The original story as written by Aykroyd was very different than what would be eventually filmed.
In that version a group of Ghostbusters would travel through time, space and other dimensions taking on huge ghosts (of which the Stay-Puft Marshmallow Man was just one of many). Also, the Ghostbusters wore S.W.A.T.-like outfits and used wands instead of Proton Packs to fight the ghosts; Ghostbusters storyboards show them wearing riotsquad-type helmets with movable transparent visors.
Aykroyd pitched his story to director / producer Ivan Reitman, who liked the basic idea but immediately saw the budgetary impossibilities demanded by Aykroyd's first draft.
At Reitman's suggestion, the story was given a major overhaul, eventually evolving into the final screenplay which Aykroyd and Ramis hammered out over the course of three weeks in a Martha's Vineyard bomb shelter.