Three eccentric parapsychologists are thrown out of the university and decide to set up an unusual business in New York: catching ghosts on demand. Just as their venture begins to take off, a wave of paranormal activity shakes the city, linked to an ancient Sumerian god who threatens to unleash the apocalypse from a Manhattan building. Armed with their proton packs and their cheeky sense of humor, the Ghostbusters must save the city from a colossal supernatural enemy. Ivan Reitman directs a supernatural comedy that became a cultural phenomenon, with witty one-liners, memorable effects and an unforgettable theme song.