A major moment will take place for Kate Beckett on Castle Season 6 Episode 12:

She'll meet Castle's father! Except she won't exactly know it at the time.

On Monday's installment, aptly titled "Deep Cover," Jams Brolin will reprise his role as Rick's dad, Jackson Hunt. But he goes by the name Anderson Cross in the following sneak peek, as Castle and Beckett's investigation lead them straight into Cross' office.

What role does he play? Why is he going by an alias? Will Kate find out the truth?

You'll need to tune in to find out. But you can watch Castle online at TV Fanatic and watch this clip for a fun tease:

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