The boys, including new Detective Sullivan, look a little wary when Agent Beckett shows up at the 12th on Castle. "Need to Know" is the third episode of the show's sixth season.
The gang at the 12th precinct go all out in the hopes that a delusional witness will lead them to a killer on Castle. "That '70s Show" is the 20th episode of the show's sixth season.
But we have an even bigger question and it has nothing to do with murder. If Castle and Beckett dive back in to his mysterious disappearance, will Esposito have Castle's back this time?