Weaver: Cast won't do 'Ghostbusters 3' without Bill

'Ghostbusters 3' will be scrapped if Bill Murray refuses to sign up.

Plans for a third instalment in the franchise have been mooted for several months, but now Sigourney Weaver has admitted she and the rest of the cast of the first films are unlikely to go ahead with the project if the actor – who has previously said he hasn't read the script – won't take part.