For those wondering as to why Nathan Fillion’s Richard Castle looks akin to a kid in a candy store, well, you can stop wondering now. Because we’ve got your first look at the upcoming March 21st episode of CASTLE that not only has Fillion winking at his One Life to Live roots as a result of an investigation surrounding a soap opera writer’s murder, but also features an slew of soapy cameos including Corbin Bernsen (THE YOUNG AND THE RESTLESS), Rebecca Budig (ALL MY CHILDREN), Cameron Mathison (ALL MY CHILDREN) and Jane Seymour (DR. QUINN, MEDICINE WOMAN). More first look photos of which can be found after the jump. 
