Sneak Peek of Castle Season 5, Episode 6, “The Final Frontier”: A Man From Kate Beckett’s Past Exposes Her [SPOILER]! (VIDEO)
There have been hints at Beckett's past in other sneak peeks, but in this clip, an old friend has shocking proof of who she used to be — including quite a nickname!
Original Air Date: Castle Season 5, Episode 6: "The Final Frontier" airs on Monday, Nov. 5, 2012, at 10 p.m. ET on ABC.