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A parasitic being takes an invasive position inside the host's body

A parasite, parasitical being, or a parasitic organism, was a type of organism that has a symbiotic relationship with a host organism that is harmed in the process. In some cases, the parasite can take control of the body, but this is uncommon.

Philippa Georgiou considered children parasites, stating that she had to find someone else to feed hers or she never would have gotten anything done. (DIS: "Point of Light")

After Nomad was initially beamed aboard the USS Enterprise, Captain James T. Kirk, believing it was some sort of small spacecraft, informed the device that "if you care to leave your ship, we'll provide the necessary life support systems." Nomad found the statement to be a "non sequitur," further explaining that "I contain no parasitical beings. I am Nomad." (TOS: "The Changeling")

On Argelius II a non-corporeal entity that fed on fear assumed the form of one of the planet's inhabitants. It was later discovered the same entity had taken the form of "Jack the Ripper" in Terran history. The entity traveled between planets taking over host humanoid bodies. The entity then used the host body to murder women to feed on their fear. The entity took complete control of the body, making it harmful and the host was no longer conscious of its surroundings. (TOS: "Wolf in the Fold")

During a scan of Aldean DNA, Doctor Beverly Crusher was able to confirm that parasitic organisms were not responsible for the Aldeans' sterility. (TNG: "When The Bough Breaks")

The parasitic beings that invaded Starfleet Command were another type of parasite. Officers of Starfleet were taken over by neural parasites that attached themselves to the spinal cord and brain of the host. The host was left unable to control his own actions, and in the case of the Queen parasite, the host's body was left destroyed when the Queen exited. (TNG: "Conspiracy")

In 2377, B'Elanna Torres fainted while in engineering. Icheb scanned her with a medical tricorder and detected a lifeform inside her. He quickly believed it to be a parasite. Seven of Nine then did her own scan and found she was actually pregnant with her first child. (VOY: "Lineage")

In the final draft script of TOS: "The Menagerie, Part I", when James T. Kirk suggested there might be advanced surgical methods on Talos IV, Commodore Mendez replied to Kirk that, in the single reference which Spock's report about Talos IV had made to life there, Spock had described it as "feeble and parasitic." Mendez added, "Parasites hardly make skilled surgeons."
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