After the phenomenal success of Ghostbusters, Columbia Pictures wanted a sequel but struggled to overcome objections from the cast and crew. As with the first film, Aykroyd and Ramis collaborated on the script, which went through many variations. The pair wanted to convey a message about the consequences of negative human emotions in large cities. They settled on the idea of negative feelings creating a mass of supernatural slime beneath New York City that empowers malevolent spirits. With a budget of $30–40 million, filming took place between November 1988 and March 1989 in New York City and Los Angeles. Production was rushed compared to the original film’s 13-month cycle; large sections of the film were scrapped after poorly received test screenings. New scenes were written and filmed during re-shoots between March and April 1989, only two months before its release.

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