Dan Aykroyd has said that Ghostbusters 3 could begin filming as early as next year.

Aykroyd, who is working on a new sequel with original series director Ivan Reitman, revealed that he feels "re-encouraged, reinvigorated" by writer Etan Cohen's new screenplay.

"I know that we're expecting half of the screenplay to be completed very soon. It should be into production by the fall and be shooting by the New Year," he told ABC News.

"I won't say anything, it's very exciting. The Higgs boson and the particle theories, gluons and mesons, that really gives us a scientific base in terms of our fictional storytelling, to open up to another dimension and have something horrible come through."

Aykroyd added that Ghostbusters 3 will put the franchise into "ninth gear" and attempt to bring back Bill Murray's Peter Venkman.

"It's going to be very, very exciting. I've been more encouraged than I ever have been. It sounds real now," he said.

"We've got a sharp new writer on it, Ivan is on it, Harold [Ramis] is on it, I'm on it. And if I can put the catch-net on Billy [Murray] and bring him in, it will be wonderful, if he decides to do it. There will always be a hole for him."

Aykroyd insisted that Murray never read the previous Ghostbusters 3 script, which he worked on with The Office duo Lee Eisenberg and Gene Stupnitsky.

"I don't think he read it, because, you know what? If he'd read the second draft that I completely rewrote, he would be doing the movie," he explained. "If he'd read that draft. The part I wrote for him."

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