Andrew Marlowe

Castle Season 5, Episode 5: "Probable Cause" brought the return of a familiar face — the infamous Triple Killer, aka 3XK. Unfortunately, the episode didn't give us the closure we'd hoped for, as the psychotic serial killer disappeared without a trace.

Like most die-hard Castle fans, we're anxious to know what really happened to 3XK and whether or not he'll rear his head again. When...

Richard Castle and Kate Beckett aren't the only ones experiencing significant growing pains in Castle Season 5. For Rick's 18-year-old daughter, Alexis, this season marks the end of adolescence and the beginning of adulthood. Now a freshman at Columbia University, Alexis is not only adapting to life on her own, but she's also faced with her father's burgeoning relationship.

When Wetpaint...

Next week, TV's hottest primetime couple will spend their very first Christmas together in Castle Season 5, Episode 9: "Secret Santa." While the mysterious murder of a man dressed as Kris Kringle challenges Castle and Beckett's crime-solving skills, it's the stressful nature of the holidays that puts their relationship to the test.

Will the festivities bring yuletide bliss for the mystery...