American actor, known for Blade Runner, Under Fire and Six Feet Under, who played T'Pol's mother T'Les in the fourth season of Star Trek: Enterprise.
Joanna Cassidy is an American actor whose best-known film roles are the replicant Zhora in Blade Runner and Dolores in Who Framed Roger Rabbit. Her television work includes Buffalo Bill, which won her a Golden Globe, and Six Feet Under.
In Star Trek: Enterprise she plays T'Les, the mother of T'Pol, in the fourth season. She first appears in the episode Home, in which T'Pol brings Tucker to Vulcan and learns that her mother lost her post at the Science Academy; T'Pol agrees to marry Koss to have her reinstated.
T'Les returns in Awakening, the middle part of the Vulcan trilogy, where she is revealed to be a Syrrannite and is killed when the High Command bombards the sanctuary in the Forge.