The upcoming episodes of NCIS season 20 will feature a gripping murder case and a Russian conspiracy. Agents Tim McGee and Alden Parker will investigate a suspicious murder in the National Archive that may be linked to Russian spies. Meanwhile, Dr Jimmy Palmer's relationship with Jessica Knight could face a challenge when Jimmy accidentally makes a confession. The two-part episode will see the team uncover unexpected twists and potentially face a major returning villain. The UK release date for NCIS season 20 is yet to be announced.