Question: do all the original ghostbusters appear in the new movie

Answer: No, A third Ghostbusters film had been in various stages of development following the release of Ghostbusters II in 1989. As a result of original cast member Bill Murray's refusal to commit to the project and the death of fellow cast member Harold Ramis in 2014, Sony decided to reboot the series. Much of the original film's cast make cameo appearances in new roles. The announcement of the female-led cast in 2015 drew a polarized response from the public and Internet backlash, leading to the film's IMDb page and associated YouTube videos receiving low ratings prior to the film's release.