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.
Lanie, Castle, and Ryan are swapping theories but at this point they have no idea that their latest murder will lead them to the Captain's estranged sister.
I think Ryan's about to tell Castle and Beckett about their surprising crime scene guest on Castle. "The Good, The Bad, and The Baby" is the tenth episode of the show's sixth season.