During a recent interview with talk show host Larry King, Dan Aykroyd spilled some intriguing new details about Ghostbusters 3. The actor-screenwriter teased that the story is based on particle physics research being done at Columbia University.

"It's based on new research that's being done in particle physics by the young men and women at Columbia University. Basically, there's research being done that I can say that the world or the dimension that we live in, our four planes of existence, length, height, width and time, become threatened by some of the research that's being done. Ghostbusters -- new Ghostbusters -- have to come and solve the problem."
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Dan Aykroyd also revealed that, while Bill Murray currently has no plans to reprise his role as Dr. Peter Venkman, they are still holding a spot for him in the cast, should he have a change of heart.

"There will be a hole for him. If Billy wants to walk in the door and be in the movie, we will find a place."

The actor also said that there is a role for Larry King, who starred as himself in the original Ghostbusters.

"Of course, we're going to be doing you in your new format as you comment on what's happening in Manhattan up there at Morningside Heights. It's going to be quite a spectacular scene once the stuff starts to break."

Ivan Reitman is directing from a screenplay by Gene Stupnitsky and Lee Eisenberg, although it isn't known when production may begin. There is a rumor that Sony may try to get this sequel in theaters next year, in time for the original Ghostbusters' 30th anniversary.