UPN airs the 74th episode of Star Trek: Voyager. 
Stardate 51244.3: The strain of the long journey appears to be taking its toll on Voyager’s crew – Janeway seems more irritable than usual, B’Elanna and Tom more amorous than usual, and everyone seems to be on edge. At first, the abnormal behavior is dismissed as stress, until actual physical changes accompany them – Chakotay experiences the premature onset of old age, and Neelix is mutated into a species related to Talaxians. When the Doctor and B’Elanna investigate, they find that the crew is being tampered with down to the genetic level, but before this information can be relayed to Janeway, B’Elanna falls ill and the Doctor’s remote holographic projector is mysteriously damaged. The Doctor warns Seven of Nine, and she discovers that there are aliens – invisible to most visible wavelengths – conducting experiments on the entire crew. Seven must bring the experiments to a halt while keeping the aliens from realizing that she is aware of their presence.
teleplay by Lisa Klink
story by Sherry Klein and Harry “Doc” Kloor
directed by David Livingston
music by Jay ChattawayCast: Kate Mulgrew (Captain Kathryn Janeway), Robert Beltran (Chakotay), Roxann Biggs-Dawson (B’Elanna Torres), Robert Duncan McNeill (Tom Paris), Ethan Phillips (Neelix), Robert Picardo (The Doctor), Jeri Ryan (Seven of Nine), Tim Russ (Tuvok), Garrett Wang (Ensign Harry Kim), Annette Helde (Takar), Rosemary Forsyth (Alzen)
LogBook entry by Earl Green