Ghostbusters II: Directed by Ivan Reitman. With Bill Murray, Dan Aykroyd, Sigourney Weaver, Harold Ramis. The discovery of a massive river of ectoplasm and a resurgence of spectral activity allows the staff of Ghostbusters to revive the business. Five years after they defeated Gozer, the Ghostbusters are out of business. When Dana begins to have ghost problems again, the boys come out of retirement to aid her and hopefully save New York City from a new paranormal threat.