NCIS: Season 5, Episode 10

5 - 10: Corporal Punishment

The NCIS team pays a heavy price when they try to track down a Marine who believes he is still in Iraq. After a violent confrontation in which DiNozzo, McGee and Ziva are injured, the team realizes the Marine is the subject of a secret experiment. Things are further complicated when a Senator's aide begins interfering with the investigation, since the Marine was due to be awarded a medal by the Senator and such an incident would be bad for his public image. The team suspects that the Marine was an unknowing subject of a secret super soldier experiment, until they discover that he had been secretly taking steroids in order to qualify for the Marines. Due to drug use, the Marine is bound to be discharged and his medal withheld. Gibbs, sympathetic for the young Marine, gives him one of his own unused medals instead.