Star Trek: Raumschiff Voyager Cathexis (1995–2001) watch online HD

First appearance of Captain Janeway's "Ancient English Holonovel," which seems to be a mash-up of Charlotte Brontë's Jane Eyre and Henry James' Turn of the Screw. The latter was also the basis for a previous Star Trek production Star Trek: The Next Generation: Sub Rosa (1994). The next appearance of the Holonovel happens in Star Trek: Voyager: Learning Curve (1995).

The title refers to the process of investment of mental or emotional energy in a person, object, or idea when applied to mental processes or psychodynamics.

Janeway's holonovel later returns in both "Learning Curve" and "Persistence of Vision".

According to Michael Piller, the episode was originally inspired by or, at least, had similarities with the Agatha Christie novel And Then There Were None, which has also been published and filmed under the title Ten Little Indians.

During this episode, Tuvok's rank switches from lieutenant commander to lieutenant and back again a number of times. By the end of the episode, he is wearing the rank of lieutenant. His rank remains that of lieutenant until the fourth season episode "Revulsion", in which he is officially promoted to the rank of lieutenant commander. There is no scripted reason why Tuvok's rank changes during this episode, and it may be that it was simply an error in costuming for him to have been wearing a lieutenant commander rank for the first half of the first season; he is referred to as "lieutenant" several times in earlier episodes, despite wearing lieutenant commander rank insignia.

This is the second of two consecutive episodes in which Janeway wears her hair in a style completely different from the rest of the series; the hairstyle makes its debut appearance in "Heroes and Demons". The idea of styling Janeway's hair in this way was dropped after only two episodes, as it reportedly was difficult to keep in place. Seven of Nine later wears her hair in a similar bun, in subsequent seasons of the series.

This episode had the working title "Intruder Alert". The term ultimately used as the episode's title, "cathexis," is an ancient Greek word meaning "occupation."

While no explanation is given, Lieutenant Paris' rank is also dropped from full lieutenant to lieutenant junior grade in this episode; He went on to carry the latter rank continuously until "Thirty Days", wherein he is demoted to ensign and spends time in the brig.

The rank of Lieutenant Torres is reduced from two silver bars on her Maquis pin to one silver and one black, although this is evident from the beginning of the episode.

This takes place in 2371.

Lieutenant Durst is intrduced in this episode.

When Tuvok stuns the entire bridge crew with a wide beam setting on his phaser, this is the only time in Star Trek: Voyager (1995) that we see the wide beam phaser feature used. In fact, the only other time in the Star Trek franchise that we see a wide beam setting used on a phaser is in the Star Trek (1966) episode The Return of the Archons.

This episode is similar to TOS: "Spock's Brain" in that, in both episodes, a crew member's consciousness is displaced from his body.