_**The Rat from Hell**_ A Manhattan executive (Peter Weller) deals with the rats on Wall Street while defending his brownstone ‘castle’ against a literal vermin. Jennifer Dale plays his secretary while Lawrence Dane and Kenneth Welsh are on hand as colleagues. "Of Unknown Origin" (1983) strikes me as a Stephen King yarn, which makes sense when you figure that this is one of the horror author’s favorite flicks. While the compare/contrast of the protagonist’s life in his home-castle with the rat maze at work is interesting, the premise is too light IMHO to carry a feature film: a man vs. a rat…