When an astronaut training for a trip to Mars is mysteriously killed inside a Mars simulation, Castle and Beckett don spacesuits to investigate.
While the team investigates the murder of a toy company CEO, Castle uncovers a lead to his mysterious disappearance, launching him into a dangerous investigation of his own.
Castle finally gets his day in court when he takes the stand as the key witness to a murder from five months ago. But when new information suddenly arises, he and Beckett must race against the clock to prevent a miscarriage of justice.
In the premiere episode of ABC's new midseason series, "Castle," a wildly famous mystery novelist, Richard Castle (Nathan Fillion, "Desperate Housewives"), who is bored with his own success, learns that a real-world copycat killer has started staging murders from scenes depicted in his novels.
After being forbidden to work with Kate Beckett or the 12th Precinct, Castle obtains a P.I. license and shows up unannounced at Beckett's crime scene, hoping to investigate alongside her as a private eye. But things don't go as Castle had planned.
When we last saw Letscher's character, he was posing a man who provides some clues about where Rick Castle has been the last two months. But, he wasn't who said he was and vanished almost as quickly as viewers met him.
In "The Way of the Ninja," Castle and Beckett investigate the mysterious murder of a Japanese ballet dancer, they end up being targeted by a ninja assassin.
Clues in a young woman’s mysterious murder point to a suspect Castle and Beckett have dealt with before, Dr. Kelly Nieman.
Castle has meet its Jaws. And in retrospect, Jaws 2, 3, and 4 in the process. I would like say I was surprised by this but I’m not. “Sleeper” feels more like an attempt at sneaking in the Derrick Storm project than a Castle episode.
After four seasons of "will they" or "won't they," Richard Castle and Kate Beckett finally gave in to their feelings for each other in the much anticipated Season 4 finale. Season 5 picks up on the proverbial morning after, with Castle and Beckett facing new questions -- Was this a one-time fling, or are they now a couple? But before they find the answers, they must take on the forces responsible for Beckett's mother's murder that now threaten Kate Beckett's life.