C.H.U.D. (1984)
C.H.U.D. is very much an anomaly compared to the countless slahers that were being unleashed during the early 80's.
With a cast trainied adult actors, many who would go on to have good careers, and a story that didn't shy away from how dirty NYC was at the time, C.H.U.D. is a mature tale of corruption wrapped in the cloak of a "B Monster Movie". Where the heros are just ordinary people trying to stick up for those who less fortunate.
Oh, and the music by Martin Cooper and David Hughes is amazing.