Corporal Punishment
While trying to track down a delusional and violent Marine who thinks he's still in Iraq, the NCIS team learn that the man has been the subject of a secret experiment - and it comes with a high price to pay.
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More from this season
S5 E1
Bury Your Dead
The NCIS team uncover a huge secret, as their mission to capture La Grenouille comes to an explosive and deadly conclusion.
S5 E2
Family
During an autopsy, Ducky makes a startling discovery that turns a murder of a Petty Officer into a search for a missing infant.
S5 E3
Ex-File
Lt. Colonel Mann joins Gibbs in an investigation of the murder of a Marine Captain who had access to highly classified information. Things get very personal for Gibbs when one of the witnesses in the case turns out to be one of his ex-wives.
S5 E4
Identity Crisis
When Ducky realizes that one of his cadavers used for research is actually a victim of murder, the NCIS team identify him as a criminal genius who is capable of deleting the past.