The Outer Limits 1-10 "Nightmare"

After the Earth was attacked by the planet Ebon, a group of human soldiers is sent to fight the enemy on their own soil. Captured en route to Ebon, the soldiers undergo physical and psychological torture and interrogation at the hands of the Ebonites. The prisoners become paranoid when their captors claim they have received cooperation. This is further complicated by the appearance of high-ranking Earth officers among the hostile aliens. In the end, it is revealed that this was only a military test, organized by the Earth forces to test their troops' loyalty. Unexpected accidents having occurred during the test, the Ebonites, in actuality a peaceful and honorable alien race, eventually ask for the amoral experimentation to end, but they fail to prevent one last man from being killed.