Jagasrol

Jagasrol is a fictional entity appearing in the Star Trek universe. It is primarily known for its role in the episode "The Lights of Zetar" from Star Trek: The Original Series. In this context, Jagasrol is described as a powerful, disembodied, non-corporeal being, or perhaps a collective consciousness, that has existed for millions of years.

The Jagasrol are depicted as a dying race that seeks to preserve its existence by transferring its consciousness into the minds of living beings. This process is not a gentle one; it is a forceful assimilation that consumes the host's individuality and life force. In the episode, the crew of the USS Enterprise encounters a starship populated by individuals who have been taken over by the Jagasrol. These individuals become a hive mind, acting with a unified purpose to find new hosts.

The Jagasrol's motive is survival, but their method is destructive to the beings they inhabit. Their energy signature is immense, capable of disabling starships and influencing biological organisms on a large scale. The conflict in "The Lights of Zetar" centers on Captain Kirk's efforts to find a way to stop the Jagasrol from consuming his crew and to allow the beings to pass on naturally rather than through forced assimilation. The resolution involves finding a way for the Jagasrol to complete their transition without harming others.