In the second part of the story begun in "Tick, Tick, Tick," the serial killer remains at large and is taunting Castle, Beckett and Jordan Shaw to catch him

Actor Robin Williams; eliminated ``American Idol'' contestant Paige Miles; Usher performs.

Stephen breeds the elderly in captivity, and Claire McCaskill sends a message to Rush Limbaugh.

Tonight's guests are actor Joel McHale. The actor Ben McKenzie was preempted.

Mystery: Michael Lloyd Self/Murder: Rhonda Johnson and Sharon Shaw Wanted: Anthrax Killer Legend: Pawley's Island Update: Lost: Traci Kenley and Bill Rundle Mystery: C.W. Roddy

Wanted: Lissette Nukida Murder: Rebecca Young Mystery: Doris Duke Update: Wanted: Bike Path Rapist Wanted: Raymond Young Mystery: Christina Smith