"Realm of Fear" is the 128th episode of the American science fiction television series Star Trek: The Next Generation. It is the second episode of the sixth season. 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 (played by Dwight Schultz) has a paralyzing fear of the transporter and is convinced he is being attacked by a creature inside the beam.