A superhero horror flick from the mind of a director who has more than dabbled in both genres, and described by fans as a 'hidden gem', is on Film 4 tonight (Wednesday). Darkman stars Liam Neeson as scientist Peyton Westlake, who is working on creating synthetic human skin for burn victims. After he is viciously attacked and left for dead, he sets about seeking revenge. Directed and co-written by Sam Raimi, who is best known for directing the original Spider-Man trilogy and the first three