Dan Aykroyd is eyeing up a 2012 start date for Ghostbusters 3, even though Bill Murray has yet to sign up for it.
Actor and writer Dan, who is set to reprise his role as Dr Raymond Stantz in the eagerly awaited follow-up, plans to start shooting next year even if leading man Bill hasn't committed.
"That is our hope. We have an excellent script," he said on The Dennis Miller Show, Deadline reports.
"What we have to remember is that Ghostbusters is bigger than any one component, although Billy was absolutely the lead and contributed to it in a massive way, as was the director and Harold (Ramis), myself and Sigourney (Weaver)."
He continued: "The concept is much larger than any individual role and the promise of Ghostbusters 3 is that we get to hand the equipment and the franchise down to new blood."
Bill, who starred as Dr Peter Venkman in the two cult hit instalments of Ghostbusters, seemed to be getting sceptical about making a third outing.
The 59-year-old said: "We made a great movie and then we made another one, you know? So we went to the well twice and it's almost impossible to do the second movie as well."
But he later said: "I thought, 'Maybe I should just do it. Maybe it'd be fun to do.' Because the guys are funny and I miss [Rick] Moranis and Annie [Potts] and Danny [Aykroyd]... I miss them."