Police AcademyCity Under Siege is a 1989 comedy crime film starring Bubba Smith, David Graf and Michael Winslow. It was directed by Peter Bonerz and written by Stephen Curwick, based on characters created by Neal Israel and Pat Proft. The film was given a PG rating for violence and language. This was the last Police Academy sequel to be released in the year immediately following the previous installment of the series, as well as the last movie in the franchise to feature Bubba Smith, Marion Ramsey, Bruce Mahler, Lance Kinsey and George R. Robertson as Hightower, Hooks, Fackler, Proctor and Chief Hurst respectively.
After distributing flyers as to the information of the Wilson gang and getting nowhere, Nick stumbles upon a paper reporting an antique diamond heading to a museum, and gets an idea to use it as bait however the robbers nab the diamond anyway by cutting a hole in the truck and escaping through the sewer system. Nick then decides to go undercover to get information regarding a possible hideout, but Harris decides to go undercover to get a confession. Despite his fear of heights, Harris goes undercover as a window washer at a tall building and gets a confession of himself on tape after Proctor accidentally knocks him over the balcony.The robberies are committed by a group of three dimwitted criminals who dont seem to be able to do this on their own, and its revealed they are being guided by a literally shadow figure known as the Mastermind, who speaks to the three behind a wall of glass and uses a voice distortion device. He devises a plan to get the cops out of the way. ........
Source: Wikipedia