- Lt. Commander Geordi La Forge and an old friend fight to defeat a parasite that is trying to transform them into another species.
- Lieutenant Commander Geordi La Forge realizes that he, his friend Lt. Commander Susanna Leitjen and Lieutenant Hickman who deserted in a shuttle-craft and is now on a suicidal course to a planet were all in a mission made years ago by the USS Victory, the others are missing but more vessels are detected on the same planet. After investigations of the base on the planet it turns out they were affected by a yet unknown, parasitic alien race, which is already in both Gordi and Susanna, how is beyond Dr. Crusher's diagnosis, and starts transforming from a cellular level first her into a blue critter, later him too, while he continues researching Starfleet records and hologram simulation, while closely monitored...—KGF Vissers
- Five years after participating in away team, members of the team are being drawn back to the same planet. Geordi La Forge and his colleague Lt. Cmdr, Susanna Leijten are the only two remaining members of the group not yet affected but both anticipate problems ahead. Susanna begins to transform into another being and Dr. Crusher concludes that the away team members were infected with some type of parasite that has been gestating in their hosts all of this time. While Susanna is in sick bay, her transformation nearly complete, Geordi begins to transform and he beams himself down to the planet. Once Dr. Crusher finds a way to reverse the metamorphosis, it's imperative that they find Geordi before he reaches the final stage of his transformation.—garykmcd
- Lieutenant Commander Geordi La Forge realizes his friend Lieutenant Hickman (Amick Byram) has deserted in a shuttle-craft. Lt. Commander Susanna Leitjen (Maryann Plunkett), Geordi, Hickman and others were part of an away team to Tarchannen III 5 years ago. Hickman was seen heading towards the planet (Tarchannen III). Geordi & the others were all on a mission 5 years ago with the USS Victory. The ship was investigating disappearances from a Starfleet outpost on the same planet 5 years ago. 49 people from the outpost were missing, with no trace and no explanations. The other members of the same mission (Martinez and Brevelle) are missing from their respective ships as well Geordi and Leitjen are the only 2 crew members from the USS Victory away team still left.
Leitjen is on the Enterprise with Geordi. The Enterprise tracks Hickman's shuttle. Picard turns the Enterprise to intercept Hickman's stolen shuttle. As they enter the Tarchannen star system, they find Hickman's shuttle on its way to the planet on a suicide run as it will burn up in the atmosphere. Picard tries to save it, but the shuttle burns up and explodes. Scanners indicate 2 more shuttles on the surface of the planet, but no life signs. Riker, Leitjen, Data, Worf and Geordi beam down to investigate.
After investigations of the base on the planet Leitjen starts behaving strangely after she discovers footprints in the sand belonging to Martinez and Brevelle. But the footprints are clearly not human, as they have a different shape. Geordi restrains her and beams back with her to the Enterprise. Beverly gives Leitjen a full scan and finds nothing. But she finds that Leitjen's blood chemistry is way off normal limits. She starts shaking uncontrollably. Data finds alien skin cells on clothing of the missing crew and uses the footprints to start a diagnostic for possible sources. Leitjen is puzzled as to why the crew returned to the planet 5 years after the original incident. Geordi figures it could be some sort of compulsion or even a hypnotic command. Leitjen has a strong urge to return to the planet and is very nervous and fidgety and keeps scratching herself.
It turns out they were affected by a yet unknown, parasitic alien race, which is already in both Geordi and Susanna. This alien is releasing chemicals from inside the body, leading to their human DNA being altered. Dr. Crusher's diagnosis cannot figure out how it got in there. It starts transforming from a cellular level first Leitjen into a blue critter, later Geordi too. Beverly finds that the cells being developed inside Leitjen are near identical to the ones found on the uniforms of the missing crew members. Beverly is sure that the cells are not auto-transmittable, so the ship is safe. It is not clear how they got inside Leitjen and Geordi in the first place.
Geordi continues to analyze the audio/visual tapes from the incident 5 years ago and finds evidence of an unknown entity watching them on the planet and maybe even responsible for placing the parasitic alien entity inside of them.
Beverly surgically removes the parasite from inside Leitjen. She wants to perform surgery on Geordi, but he is now too far altered and is not even identifiable by the ship's computer as Geordi. The alien DNA has camouflage abilities and can become invisible to all scanners. Geordi transports himself down to the planet. Beverly says that Geordi has an hour before the DNA changes in Geordi are permanent.
Data modifies the scanners to UV rays, but Leitjen insists that she will join the away team as she has recovered sufficiently and can locate Geordi. Leitjen locates Geordi and is able to persuade him to come back. Beverly removes the parasite in the nick of time.
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