Memphis Beat's second-season finale is setting up quite a showdown: Field of Dreams' Amy Madigan and Millenniumstar Lance Henriksen will guest-star as the heads of rival crime families, TVGuide.com has learned.Jason Lee) to crack the case before the warring families take matters into their own hands and shed more blood.Besides her role in Field of Dreams, Madigan also starred on HBO's Carnivale and has done recent guest spots on Grey's Anatomy, Law & Orderand Fringe, on which she recurs as Olivia's mother. Alienfilm franchise and on Millennium. His most recent small-screen appearances include roles on NCISand Castle. He also recently released his biography, Not Bad for a Human.Memphis Beat airs Tuesdays at 9/8c on TNT. The season finale airs Aug. 16.