Ivan Reitman’s Ghostbusters (B+) is a marvelous confection about four exterminators of ghastly spirits (droll Bill Murray, goofy Dan Akroyd, uber-serious Harold Ramis and straight man Ernie Hudson) who must save New York from a Pandora’s box of supernatural creatures run amok. Sigourney Weaver is a treat as a possessed love interest, playing giddily opposite Bill Murray’s clowning. Despite the overindulgence in silly special effects, the acting ensemble makes this piece work by playing it super-serious. The biggest laughs are in the reaction shots: Of course that’s a skyscraper sized marshmallow man! And why wouldn’t there be demonic animals running in the street? Leading man Murray is a superb match for this material with his dry wit a ribald rapier to the funky fleet week of ghosts on the loose. Reitman corrals his grinning brigade into hilarious territory as the ‘busters take on haunted New York!