Heroes and Demons

After Voyager beams aboard samples from a protostar, crew members start disappearing while using a holodeck simulation of Beowulf, beginning with Harry Kim. Reasoning that a hologram may be safe from whatever is taking them, Janeway sends the Doctor into the programme. Calling himself Schweitzer, he joins the saga in King Hrothgar's hall, where the shieldmaiden Freya takes a romantic interest in him. When he faces the creature terrorising the hall, it tears off his arm. The Doctor discovers that the protostar samples contained living energy beings, and that their kind have been converting the missing crew into energy in an effort to get them back. Freya is killed by Unferth. Once the captive life forms are released onto the holodeck, the missing crew members return to physical form. Afterwards the Doctor decides against keeping the name Schweitzer, because of the painful memories now attached to it.