NCIS star Wilmer Valderrama has shaved his head for the show's Season 20 finale, which will focus on his character, Nick Torres, being in prison. The episode, titled "Black Sky," is expected to have ramifications leading into Season 21. Valderrama praised the show's writers for their collaboration in building his character's arc. NCIS has a history of cliffhangers, including character deaths, departures, and explosive events. Valderrama revealed that the best advice he received was from Robin Williams: "Never forget. And always remember ... It's supposed to be fun." The finale will air on May 22.