Target Unknown (also known as Prisoner of War) is a 1951 American war film directed by George Sherman and starring Mark Stevens, Alex Nicol and Robert Douglas. An American bomber crew are forced to bail out over Occupied France in 1944 and are captured by the Germans, who subject them to strenuous interrogation. The film begins with a written foreword that reads: "In the making of this picture, the cooperation of the Department of Defense and the United States Air Force is gratefully acknowledged."

Plot

In 1944 at a United States Army Air Forces air base in England, Capt. James M. "Steve" Stevens and his Martin B-26 Marauder bomber crew are assigned to a second bombing mission of the day. The men are exhausted both physically and emotionally because the squadron has been repeatedly attacked by the enemy, possibly because someone has leaked information about the raids. The men have been warned that the Germans employ clever and insidious methods of extracting vital information from downed flyers.