Ghostbusters is a 1984 American supernatural comedy film directed and produced by Ivan Reitman and written by Dan Aykroyd and Harold Ramis. The film stars Bill Murray, Aykroyd and Ramis as three eccentric parapsychologists who start a ghost-catching business in New York City. Sigourney Weaver and Rick Moranis co-star as a client and her neighbor, and Ernie Hudson as the Ghostbusters' first recruit.
Aykroyd conceived the film as a project for himself and fellow Saturday Night Live alumnus John Belushi, with the "Ghostmashers" travelling through time and space in the future with magic wands. He and Ramis dramatically rewrote the script following Belushi's death and after Reitman deemed Aykroyd's initial vision financially impractical.