Doug Simpson

As the BAU investigates targeted killings in Tampa, they also deal with their own feelings about the loss of Prentiss.

On the season finale, Castle and Beckett's long-awaited wedding is almost here, but when a shocking surprise threatens to ruin the big day, they are sent on a wild mission filled with masked men, angry bikers and a charming ne'er-do-well from Beckett's past.

Derek, Meredith, Arizona and Cristina receive news about the plane crash lawsuit; Richard avoids Catherine's advances; Jackson takes on one of Mark Sloane's former patients.

Dre schools Andre Jr. in the art of "Playing The Dozens," trash talking someone into submission, after he's intimidated by a bully at school, but he succeeds a little too well with his plan; Bow struggles with sleep deprivation when Diane develops a fear of the dark.

After forgetting to call ahead at a fancy restaurant, Jeff (Patrick Warburton) hopes that dressing Audrey (Megyn Price) as a well-known celebrity will get them a reservation. Timmy (Adhir Kalyan) doesn't understand the humor of "The Three Stooges" when Adam (Oliver Hudson) excitedly invites him over for a movie night. Russell (David Spade) joins Liz (Wendi McLendon-Covey) at a sex addicts meeting, only to aggressively flirt with the women.