Heroes and Demons

Star Trek: Voyager  Season 1 Episode 12

Air Date: 4/24/1995

Stardate: 48693.2 When crew members encounter an alien life form inside a holographic version of Beowulf, it transforms them into pure energy. As the only crew member likely to be unaffected, Janeway orders the Doctor to search for his missing colleagues - despite his misgivings about his ability to succeed.