Ghostbusters III a go, Dan Aykroyd says

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Ghostbusters IIIincomplete utterancesBoston Globe

In 2005, Harold Ramis said that he was considering making a third Ghostbusters film written by Dan Akroyd and set to star Ben Stiller alongside the original line-up with the apparent omission of Bill Murray. (At that time, Murray was still on his post-Lost in Translation quest for an Oscar and, with the exception of some voice acting in Garfield, was avoiding comedies like the plague.)