The film's success spawned the "Ghostbusters" franchise, comprising animated television shows, film sequels, reboots, and video games. The film was followed by the 1986 animated television series "The Real Ghostbusters" (later renamed "Slimer! and The Real Ghostbusters"). It ran for 140 episodes over seven seasons across six years, and itself spawned a spin-off Slimer-centric sub-series, comic books, and merchandise. It was followed by a sequel series, 1997's "Extreme Ghostbusters". A film sequel, "Ghostbusters II", was released in 1989. Despite breaking box office records and attracting an estimated two million more people to its opening than "Ghostbusters", the sequel earned less than the original and received a less enthusiastic response.