The continuing popularity of The Real Ghostbusters led to a push for Ghostbusters II, which finally emerged in 1989. Despite reuniting most of the cast and crew, it lacked some of the spark of the first movie and was released in a crowded summer that included Batman and Lethal Weapon 2. Bill Murray’s disappointment with Ghostbusters II saw him walk away from the franchise and any attempt at a Ghostbusters 3. The studio eventually landed on a reboot with 2016’s Ghostbusters, which featured a talented cast but ultimately underperformed financially.

The Real Ghostbusters also received a spinoff series with 1997’s The Extreme Ghostbusters, which centered around Egon teaching a new generation of ghostbusters. This series only lasted a season and isn’t as well-regarded as The Real Ghostbusters, but it was entertaining in its own right. It will be interesting to see how the series evolves following the release of Ghostbusters: Afterlife, which is set to feature appearances from original cast members like Bill Murray, Sigourney Weaver and Ernie Hudson.

Next: Why Ghostbusters 3 Took 31 Years To Make