A Vulcan scientist, an authority on subspace, who comes aboard the Enterprise-D in 2369 to judge Doctor Reyga's metaphasic shield.
Doctor T'Pan is a Vulcan researcher. She appears in the episode Suspicions, played by Joan Stuart Morris.
Beverly Crusher has invited a small group of specialists to see a test of a shield that should let a shuttle fly into a star's corona. The inventor is a Ferengi, Reyga, whom few take seriously. T'Pan attends with her human husband, Doctor Christopher. She doubts the theory but agrees to watch.
The test seems to kill the Takaran pilot, Jo'Bril, and Reyga is then found dead. T'Pan is one of those Crusher questions as she looks for a murderer. The Vulcan answers without warmth and points out that Crusher has no authority to investigate. She is innocent. Jo'Bril faked his death and killed Reyga in order to steal the shield.