NCIS Season 11 Episode 17 aired on CBS in March 2014. The official synopsis for the seventeenth episode of the network's longest-running military procedural, titled 'Rock and a Hard Place', reads as follows:Backstage before a charity-benefit concert in Washington, DC, an explosion kills a Navy petty officer first-class; Gibbs and company investigate; Abby fingers the bad guy, McGee finds out about him, and Gibbs and Ellie catch him at work.The NCIS Season 11 Episode 17 cast is an impressive blend of the series' main and supporting characters, who made the narrative gripping and intense. The episode saw Gibbs and team investigate a bomb explosion at a charity concert that took the life of a Navy petty officer.Here is the complete cast.NCIS Season 11 Episode 17 cast View this post on Instagram Instagram PostFrom a charity concert gone wrong to a petty officer's death and Gibbs' impressive detective skills, 'Rock and a Hard Place' was filled with twists and turns. Here is the complete NCIS Season 11 Episode 17 cast:Mark Harmon as Supervisory Special Agent and Special Agent in Charge Leroy Jethro Gibbs: Like previous installments, the Reasonable Doubts star led the NCIS Season 11 Episode 17 cast. The most accomplished marksman of his team was on the case when a pre-planned explosion in the dressing room of a charity concert killed a Navy petty officer. While Harmon has left the NCISverse behind, his exceptional detective skills were on full display in this episode.Michael Weatherly as Senior Field Agent Anthony DiNozzo: The Tony & Ziva star is the next main addition to the NCIS Season 11 Episode 17 cast. While Weatherly's character received a mixed reaction from the audience, the senior field agent eventually grew on fans, thanks to his witty charm and impressive pop-culture humour, which brought a fun edge to the series.Sean Murray as Senior Field Agent Timothy McGee: The longest-featured cast member in the military procedural series is the main addition in the 'Rock and a Hard Place' cast. While Gibbs and the team initially believed that the bomb was placed by one of the singers' agents, it was McGee who investigated this red herring and positioned the team in the right direction.Brian Dietzen as Dr. Jimmy Palmer: Dietzen's recurring character is the next main addition to the NCIS Season 11 Episode 17 cast, who is still very much a part of the current ensemble. This episode featured an interesting storyline for Palmer, one where he connected with his birth mother.Emily Wickersham as Special Agent Ellie Bishop: 'Rock and a Hard Place' was an important entry for Bishop as she teamed up with Gibbs to uncover the real mastermind who planted the bomb in the venue's dressing room.Here's the supporting and guest cast in 'Rock and a Hard Place' View this post on Instagram Instagram PostIn addition to the main NCIS Season 11 Episode 17 cast, 'Rock and a Hard Place' featured the supporting ensemble, including Pauley Perrette as Abby Sciuto, Brian Dietzen as Jimmy Palmer and David McCallum as Donald Mallard.Rounding out the episode's cast are the following guest actors:1) Keith Carradine as Mannheim Gold2) Joel Brooks as Ronnie Mustard3) David Shatraw as Bobby Quinn4) John Sloan as Luke Pischedda5) Hank Harris as Denny Johnson6) Javi Mulero as Earl Grieve7) Sue Cremin as Vivian Sutton8) Linc Hand as Navy Petty Officer First Class Damien Hunter9) Justin Alston as Special Agent HolgateYou can stream the episode on Paramount+.The series is currently in its twenty-third season and airs weekly episodes on CBS every Tuesday. The episodes can also be streamed a day later on Paramount+.For the latest scoops on your favorite TV shows and movies, follow SoapCentral.