Star Trek: Voyager

Heroes and Demons (1x12)

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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.