Bill Murray, Dan Aykroyd, Harold Ramis, and Sigourney Weaver are back (along with producer-director Ivan Reitman) in this 1989 sequel to the hit comedy about self-appointed ghost catchers bent on saving New York from annihilation. Rather wan in its anything-goes spirit of invention, the movie has a surprisingly low number of laughs; some of the initial premises are goodthe original gang of ghostbusters starting out as a group of has-beens, a pink goo developing in the city sewage system because of the accumulation of bad vibesbut there’s very little energy in the follow-through, and this time Murray’s listlessness seems more anemic than comic. With Rick Moranis, Ernie Hudson, and Annie Potts; written by Ramis and Aykroyd. PG, 102 min. (JR)