THERE are two films on this evening which you might want to watch just to see how bad they are. The first is Maniac Cop 2 (Pearl, 9.30pm) which - and you probably do not need me to tell you this - is the sequel to Maniac Cop. The second is Fatal Beauty (Pearl, 11.35pm), more of which later. In Maniac Cop, released in 1988 when apocalyptic terminator movies were at their peak, a killer on the police force struck terror into the hearts and minds of New York City residents. At the end of it all he careened off a pier in a stolen police van and into the murky river depths. Everyone thought he was dead, but sadly they were wrong. In Maniac Cop 2 he returns to do more of the same. This is standard stalk-and-slash fare, again starring Bruce Campbell as the cop gone wrong. Underneath it all he is a good guy, but once he was framed and sent to Sing Sing prison, an experience that has left him one sandwich short of a picnic. As the synopsis so neatly puts it: ''His burning need for revenge has resulted in him forming an unholy partnership with a psychotic serial killer, the two sharing a chilling common bond . . . the need to destroy.'' FOR Whoopi Goldberg Fatal Beauty was another in her long line of post-Color Purple mistakes. This is not a film she includes on her resume. It is not even a film TVB Pearl includes on its resume. The channel has chosen instead to classify it as ''details not available'' and with good reason. Goldberg is an unlikely narcotics cop who wants to nail the obligatory bunch of despicable drug dealers. There is plenty of gratuitous violence and some of the dialogue is mind-bogglingly awful. But its message is anti-drug, as if that makes all the nastiness excusable. Fatal Beauty was directed in 1987 by Tom Holland and also stars Brad Dourif and Richard ''Cheech'' Marin. THE BBC Masterpiece Theatre Don't Leave Me This Way (World, 8.30pm) reaches its conclusion. In the first part Sandra Neil crashed over a rocky headline in her car and died. The police see it as a tragic accident, but amateur sleuth Loretta Lawson (Janet McTeer) believes differently. She consults her best friend Bridget (Imelda Staunton), who helped her solve another murder in A Masculine Ending, which World also showed in two parts recently. Staunton had smallish roles in two of Kenneth Branagh's films, Peter's Friends and Much Ado About Nothing. The duo are on to something; they discover the dead woman's toy koala bear stuffed with GBP10,000. Was she involved in something shady? Indeed she was. THE thriller Blood Moon (World, 9.30pm), set in an all-girl Catholic school, was filmed on location in and around Brisbane and the Gold Coast. Producer Stanley O'Toole is something of a pathfinder for the Australian industry. He said: ''Australia has long had a need for reasonably budgeted, well-produced and well-acted films with subject matter proven to be what people want.'' Blood Moon stars British Shakespearean actor Leon Lissek and Australian actress Christine Amor. When two hot-blooded youngsters disappear, no one worries, thinking they have simply eloped. Their bodies turn up, strangled by a barbed wire noose and it becomes evident that a campus killer is on the loose. THE ever-watchable Jessica Lange stars in The Music Box (World, 1.00am) as a liberal lawyer who discovers that her immigrant father may have been guilty of heinous Nazi war crimes. She defends him in a criminal trial but has trouble proving his innocence. Also a fine performance from Armin Mueller-Stahl, a leading German actor making his US feature debut. THE performances in Come Into My Parlour (Pearl, 8.30pm) are from some of the world's 30,000 varieties of spiders. Filmed by Oxford Scientific Films, this documentary promises to soothe our fears about the creatures. It examines their subtle courtship rituals and the caring way in which they raise their young. THERE are 28 crimes and trials in Great Crimes And Trials Of The 20th Century (World, 7.30pm). We have reached number 19, that of the massacre of the Tsar of Russia in 1918. Still to come are serial killer Ted Bundy, ladykiller Neville Heath and mass murderer John Gacy.