Episode Behind the Scenes

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The story pitch that initiated the writing of this episode had a botanical basis. Supervising Producer Kenneth Biller explained, "Bill Prady, who pitched and wrote the story [...] had this idea about the pitcher plant, a plant that sends out false pheromones to attract its prey."
According to the unauthorized reference book Delta Quadrant, the windowed corridor through which Seven of Nine carries Naomi Wildman was actually the mess hall set, and the interior of Qatai's shuttle contained many "bits and pieces" from stock, including the distress beacon from the previous episode ("Gravity").
The creature that stars in this episode is similar to a creature – described by Worf in the earlier-produced TNG: "Where Silence Has Lease" – that is said to "devour entire starships." Another creature similar to the one in this episode is Bevvox from the episode "Think Tank", which prefers a variable-gravity environment.
Seven of Nine says that the spaceship eater is the largest organism she has ever seen, at 2,000 kilometers in size. This is orders of magnitude smaller than the protozoan life form Voyager entered prior to her presence on the ship. It is also orders of magnitude smaller than other space organisms the Federation has encountered.
Ken Biller perceived this episode to be reminiscent of Star Trek: The Original Series. "It's kind of like old-fashioned Star Trek," he observed.
The creature gives a false letter to Janeway that supposedly came from Mark, saying that he had broken off his engagement to another woman. Yet from an actual letter Janeway receives in the fourth season installment "Hunters", Mark was already married to another woman.
Ken Biller did not hold this outing in high esteem. "'Bliss' was not my favorite episode [....] A big monster in space that eats starships has the potential for being silly," Biller opined.