Realm of Fear  "Realm of Fear" is the 128th episode of the American science fiction television series "". It is the second episode of the . Set in the 24th century, the series follows the adventures of the Starfleet crew of the Federation starship Enterprise-D. In this episode, Lieutenant Reginald Barclay is having a paralyzing fear of the transporter and is convinced he's being attacked by a creature inside the beam. The episode was written by Brannon Braga and directed by Cliff Bole, and was broadcast on September 28, 1992. This episode focuses on a science fiction plot about Barclay, played by actor Dwight Schultz. The overall mission involves the Enterprise 1701-D (Galaxy-class) encountering the starship USS Yosemite, which is trapped and missing her crew complement. This provides a backdrop for the fears and experiences of Barclay to be explored and is noted as case of exploring a new facet of the character which was previously oriented towards comedy relief. The "Enterprise" comes to the assistance of the USS "Yosemite", a science vessel where several crewmen have gone missing after a transporter accident. The "Enterprise" is unable to transport directly to the ship due to interference, but Lt. Reginald Barclay suggests linking the transporter systems of both ships, allowing them to transport one-by-one to the "Yosemite" albeit after a lengthy dematerialization/materialization process. Barclay, assigned as part of the team, hesitates on his turn and instead walks away. Barclay discusses the matter with Counselor Deanna Troi, who teaches him Betazoid meditation techniques to help calm himself. Transporter Chief Miles O'Brien also provides Barclay with some advice on dealing with his fears, speaking how he overcame his fear of spiders, before attempting to transport him over again. Barclay is safely transported to the "Yosemite" and continues to help the other engineering crew investigate the disappearance. On his return trip, Barclay believes he sees wormlike-creatures in the matter stream that attempt to approach him and touch his arm, but he materializes on the "Enterprise" without harm. He decides that he is suffering from transporter psychosis, a rare affliction. His paranoia forces Troi to declare him unfit for duty. Barclay asks O'Brien to review the transporter logs, and O'Brien agrees there was a strange surge during Barclay's transport. Barclay asks O'Brien to transport him again, recreating the surge, and Barclay again sees the creatures in the matter stream.