All 22 episodes from the 20th season of the US crime drama following the exploits of the Naval Criminal Investigation Service. In this season, the team work to clear Alden Parker (Gary Cole)'s name while he is still on the run, all NCIS branches unite to celebrate their former professor's retirement and the team must investigate the death of one of their own. The episodes are: 'A Family Matter: Part 2', 'Daddy Issues', 'Unearth', 'Leave No Trace', 'Guardian', 'The Good Fighter', 'Love Lost', 'Turkey Trot', 'Higher Education', 'Too Many Cooks', 'Bridges', 'Big Rig', 'Evil Eye', 'Old Wounds', 'Unusual Suspects', 'Butterfly Effect', 'Stranger in a Strange Land', 'Head Games', 'In the Spotlight', 'Second Opinion', 'Kompromat: Part1' and 'Black Sky: Part 2'.