Castle may have gotten off the hook for murder on last night's episode of this ABC favorite, but viewers are still recovering from the shock of 3XK's return.

What can they expect on next Monday's installment? A visit to "The Final Frontier," as Castle and Beckett look into a killing at a sci-convention, an event filled with ego-centric celebrities and, as summed up in the official network synopsis, "enough drama for two galaxies."

Get your first look at what's to come in the official teaser:

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.