The story involves a group of New York para psychologists, Dr. Peter Venkman (Murray), Dr. Raymond Stantz (Dan Aykroyd) and Dr. Egon Spengler (Ramis), who are kicked out of Columbia University for their offbeat research, and unscientific practices, as shown in the Bill Murray scene with the young co-ed in the esp experiment, at the beginning of the film. After gathering physical data from a scary specter they met in the basement of the New York City Public Library, they are able to set up a private company designed to rid people of pesky ghosts, through the use of unique nuclear proton/neutron guns, with wild results.

Bill Murray gives one of his most endearing performances as Dr. Peter Venkman, who overcomes his personality faults to rise to the occasion of defeating demonic entities to save Dana Barrett (Weaver) and Louis Tully (Moranis), as well as the city of New York, and the human race. While its improbable that his character would end up with Weaver, following her dis-possession, that's part of the fun.

Dan Aykroyd and Harold Ramis also both do a terrific job as Dr. Raymond Stantz and Dr.Egon Spengler, using their comedic and acting talents to bring their characters to life, and add much to the hilarious screenplay.

Ghost Buster's imaginative, creative, hilarious script was written by the very talented Dan Aykroyd and Harold Ramis. Some of the premises about ghosts in this movie are the result of a very creative imagination, which ads up to to a very entertaining movie.

While many apparitions, like the one of the elderly lady in the basement of the library, reading, at the beginning of the movie, are clearly seen in detail, and do indeed float above the floor, they usually don't turn into such a scary form that chased the trio of soon-to-be ghost busters out of the library.

Rick Moranis is particularly good as a nerd, with no savoir faire, who besides being an exercise and vitamin nut, hosts parties where he invites only his clients, so he can write off the expense. He has a big-time crush on Dana Barrett (Weaver), but he doesn't generate any reciprocal feelings from Weaver until both of them are possessed by demons.

Sigourney Weaver does a convincing job as Dana Barrett, especially when she is possessed by a demon who had earlier had been hanging out in her fridge. A favorite sequence of scenes starts when Peter comes to pick her up at her apartment to talk about her case, and she comes to the door in a possessed state. Sigourney Weaver's performance was pretty convincing and scary, and she is totally convincing as a woman possessed by a demon in these scenes with Bill Murray, but the scariness was kept in check with Bill's funny lines, and reactions, creating a fun balance appropriate for a comedy.

The film has many ghostly FX. The Visual Effects are courtesy of Richard Edlund. Toward the end of the movie, after the grid is shut down by the EPA, many ghostly apparitions, vapors, mists, etc. invade the city. A cloudy mist goes up the tailpipe of a taxi, and a ghoul is seen driving the taxi, crashing into the side of the street, with a passenger in the back. The coming of Gozer, the demon dogs, the activity in Dana's kitchen and refrigerator are brought to life with a scary reality.

Favorite Scenes: The "green spud" flying around the ritzy hotel, eating and drinking other's meals, and the battle scene in the main ball room between this green spud, and the Ghost Busters is most realistic and entertaining. The script also spoofs war movies, that have scenes of untried, rookie soldiers trying to cope before, during and after their first major battle, and how they learn to fight as a team to be victorious. Also, the script also spoofs war movies, that have scenes of untried, rookie soldiers trying to cope before, during and after their first major battle. The grand battle at the end with the coming into our world by Gozer, an ancient Babylonian god and the ending is also most enjoyable, scary, adventuresome, and funny at the same time.

While many apparitions, like the one of the elderly lady in the basement of the library, reading, at the beginning of the movie, are clearly seen in detail, and do indeed float above the floor, they usually don't turn into such a scary form that chased the trio of soon-to-be ghost busters out of the library.

The film's theme song, "Who you are going to call?" by Ray Parker Junior, was a monster hit. Elmer Bernstein also did a great job on the film score, producing appropriately spooky music where needed.