Zielons

Zielons are a fictional species from the science fiction universe of "Star Trek." They were first introduced in the animated series episode "The Survivor," which aired in 1973. Zielons are depicted as a silicon-based life form, meaning their biological structure is fundamentally different from carbon-based life, like humans. This difference in biology often leads to unique physiological and societal characteristics in fictional alien races.

In their sole on-screen appearance, the Zielons were portrayed as technologically advanced and possessing a deep understanding of their own biology. They were also shown to be capable of interstellar travel. Their appearance was described as crystalline or rock-like, consistent with their silicon-based nature. The episode focused on a conflict involving a Zielon who had infiltrated Starfleet and was posing as a human. This storyline explored themes of identity, deception, and the challenges of understanding truly alien life forms. While the Zielons have not reappeared in subsequent Star Trek series or films, they remain a notable example of the franchise's exploration of diverse and unconventional alien biology.