The absence of a specific character, Mabus, from subsequent episodes of Star Trek: Voyager after their initial appearance represents a common occurrence in episodic television. Characters introduced in standalone episodes often do not return due to various production and narrative decisions. This non-recurring status is particularly frequent for antagonists or characters whose storylines are resolved within a single episode.
The focus of Voyager remained primarily on its core crew and their ongoing journey home. Introducing and developing secondary characters required significant screen time, potentially detracting from the central narrative arc and character development of the main cast. Furthermore, budgetary constraints and the episodic nature of the show often prioritized new stories and characters over revisiting previously introduced individuals. The narrative structure often favored closure within individual episodes, limiting opportunities for recurring roles, especially for those not directly related to the crew’s established goals.