The Killing Game (Part I)

When the Hirogen capture and board Voyager, they discover that they can use the holodeck to improve the hunt by putting the prey through different situations and locations. In one simulation, Captain Janeway, Torres, Tuvok, and Seven of Nine are members of the French resistance in occupied France during World War II, with the Hirogen in roles as Nazi SS Officers. Since the Hirogen implanted the crew with subdermal transmitters, they have no idea this is on the holodeck with the safety protocols removed, and they think it's real.

Synopsis adapted from TVmaze (CC BY-SA 4.0)