Episode Title: "HEROES AND DEMONS"
Production Number: 812
Original Air Date: 04-24-95
As the Voyager takes samples of photonic energy near a protostar, Ensign Kim vanishes while in a holodeck simulation based on "Beowulf." While looking for Kim, Chakotay and Tuvok also disappear from the holodeck. The crew discovers that some of the photonic energy they were studying has entered the holodeck and is affecting its systems.
Captain Janeway sends the Emergency Medical Hologram to the holodeck to investigate the three officers' disappearance, since he cannot be killed by photonic energy. He interacts with the holodeck characters and encounters the beast Grendel, a photonic life form manifesting in the holodeck, and he releases another photonic life form that the Voyager had unknowingly imprisoned, in exchange for the return of the missing officers.
Factoid: The Vok'Sha of Rakella Prime believe that hate is a beast that lives inside the stomach; their greatest mythical hero is a man who ate stones for 23 days to kill the beast and became a saint.
Factoid: There are no demons in Vulcan literature.
Factoid: The E.M.H. finally chooses a name for himself -- Dr. Schweitzer -- but gives it up after his traumatic experiences in the holodeck under that name.
KEY: [brackets]=illusions *star=first appearance