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Perhaps the most human character known aboard the Enterprise, Barclay had many flaws that he was forced to overcome. He was shy and insular with a tendency to stutter, fearful of being transported, having a holofiction problem, and was a hypochondriac.
His holofiction problem was first seen in the episode "Hollow Pursuits", in which he created simulacrum of the ship's bridge officers who behaved very differently than their "real life" counterparts; for example, his version of Captain Picard was a weakling who cowered before him, while Deanna Troi was in love with Barclay.
In the episode " Realm of Fear ", Barclay dealt with transporter phobia when assigned to an away team. Though he was capable of allowing himself to be transported, he believed that he saw large worm-like creatures while in transit. When no evidence of a problem was found, Barclay believed himself to be going mad; however, DataBrent Spiner as Data on Star Trek: The Next Generation Data played by Brent Spiner, is a character in the Star Trek fictional universe. He has served as the second officer and operations manager on the USS Enterprise D and USS Enterprise E. Data appeared and Geordi LaForge afterwards discovered that these were human patterns in the device's pattern buffer, thought lost in transit. With Barclay's help, these people were materialized, alive and whole.
In " Genesis ", Barclay's T-cells had a bizarre reaction to a medicineSee drugs, medication, and pharmacology for substances that treat patients. This article is about medical practice. Medicine is a branch of health science concerned with restoring and maintaining health and wellness. Broadly, it is the practical science o, creating an airborne virusA common alternate meaning of virus is computer virus. Other meanings, as well as a discussion of pluralization, are at plural of virus''. bacteriophage (left center); an animal virus (top right); and a retrovirus (bottom right). Viruses depend on the hos which caused Barclay to de evolveThis article is about biological evolution. For other possible meanings, see Evolution (disambiguation). Evolution generally refers to any process of change over time. However, in the context of the life sciences, evolution is a change in the genetic make into a spiderSuborder Mesothelae Liphistiidae (primitive burrowing spiders) Suborder Mygalomorphae Atypidae ( atypical tarantula) Antrodiaetidae ( folding trapdoor spider) Mecicobothriidae ( dwarf tarantulas) Hexathelidae ( venomous funnel-web tarantula) Dipluridae ( and its other victims to revert to various earlier forms.
Barclay remained under Picard's command after the destruction of the Enterprise-D, for a few years on the Enterprise-E until being re-assigned to Starfleet Headquarters circa 2375. Working on the Pathfinder project, Barclay became obsessed with the crew of the lost USS Voyager, which had been stranded in the Delta Quadrant for about four years. He created simulacrum of the Voyager crew on a holodeck based on the facts available to him. With the help of those holograms and the real-life Troi, he devised a clever way to use a tiny wormhole to establish two-way communication with Voyager.
An alternate future in the Voyager series finale " Endgame" showed Barclay teaching at Starfleet Academy.