The best episode written by Kate Sargeant is "The Final Frontier", rated 7.929/10 from 14 user votes. It was "directed by Jonathan Frakes". "The Final Frontier" aired on 11/5/2012 and is rated 0.3 point(s) higher than their second highest rated, "Once Upon a Crime".
When a body is found at a sci-fi convention, Castle and Beckett are warped into the heart of fandom -- a world of egotistic celebrities, diehard costumed fans and enough drama for two galaxies.
Director: Jonathan Frakes
Writer: Kate Sargeant
When a woman dressed as Red Riding Hood is found dead in the woods with claw marks covering her body, and soon after a murdered Snow White is discovered with a poison apple in her hand, Castle & Beckett find themselves on a Grimm hunt to catch a fairytale killer before he kills again. But nothing is as it seems in a case filled with deceit, betrayal, secrets and murder
Director: Jeff Bleckner
Writer: Kate Sargeant
Garza and the team are on the hunt for a ruthless gang leader on a mission for revenge. Atlas comes to town to reconnect with Laura, but the two cannot seem to see eye-to-eye, and Simone and Carter grapple with letting go of old grudges. The crossover starts on The Rookie S05E17 The Enemy Within (I).
Director: Robert Bella
Writer: Kate Sargeant
When a half-naked woman is found covered in caramel sauce and hanging by bondage cuffs in a public park, Castle and Beckett's investigation takes them into New York's underground world of sexual domination. Naturally the case serves as sexy fodder for their already charged relationship banter.
Director: Rob Bowman
Writer: Kate Sargeant
Remi races against the ever-worsening ZIP poisoning to enact her ultimate plan.
Director: David S. Tuttman
Writer: Kate Sargeant
An active bomber forces the team to delve into a case from their past.
Director: Kristin Windell
Writer: Kate Sargeant
The team discovers an international conspiracy when a deadly weapon is stolen, Jane supports Weller when someone from his past dredges up painful memories, and Patterson and Rich contend with their newly released hacker accomplice.
Director: David McWhirter
Writer: Kate Sargeant