Star Trek: Voyager
Heroes and Demons (1x12)
:
Stardate: 48693.2
Harry Kim disappears from the holodeck during his holo-novel, "Beowulf." According to the characters, he died at the hands of a mystical beast known as "Grendel". When Chakotay and Tuvok also dissapear, the Doctor is transferred to the holodeck to investigate.