LONDON -- Who you gonna call if you want to know about Ghostbusters 3?

Sigourney Weaver, apparently.

In London to promote James Cameron's Avatar, in which she has a role, the actress revealed quite a bit about the supernatural sequel in an interview with a British TV channel.

"I might be in it and I see nothing wrong with being in it. I don't think I will have a big part in it. I think Bill Murray has a little more to do with it," she said, adding, "He might be a ghost."

She also said her character's son, Oscar, who was kidnapped in the last movie, has grown up to be a ghostbuster.

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