CASTLE - "Head Case" - Gunshots, a fleeing van and a massive blood pool all point to murder, but when Castle & Beckett arrive at the crime scene, they discover that it lacks something - the victim! The investigation leads to the cutting-edge world of life-extension science, a cunning high-tech researcher (guest star William Atherton), and a sleazy porn mogul who invested in a modern-day "fountain of youth." Meanwhile, Alexis finds out whether she got into Stanford, on "Castle," MONDAY, OCTOBER 3 (10:01-11:00 p.m., ET), on the ABC Television Network. (ABC/ADAM TAYLOR)
NATHAN FILLION