I wonder what percentage of Star Trek incarnations have an encounter with a malfunctioning holodeck. This device is so beyond reality that no one ever explains how it works. In this one, Harry gets messed up in a Beowulf novel setting. Of course, there is another alien presence that gets into the mix and he and others find themselves captive. The high point is the involvement of the Doctor who, because he is a hologram, gets into the action. Hs character is so much more interesting than most on board the ship.