(written from a Production point of view)
Thelma Lee (9 November 1916 – 11 March 2012; age 95), birth name Thelma Laderman, was the actress who portrayed Kahlest in the Star Trek: The Next Generation third season episode "Sins of the Father" in 1990.
Lee started her career as a comedienne in the comedy series Toast of the Town in the early 1960s. She is the sister of late actress and producer Madeline Lee Gilford.  Since 1979 she was featured in the drama Voices (1979, with Franc Luz), the drama The King of Comedy (1982), the television comedy Izzy & Moe (1985, with Roy Brocksmith), the science fiction film They Live (1988, with Meg Foster, Gregory J. Barnett, Jimmy Nickerson, Jeff Imada, and Unit Production Manager Stratton Leopold), the television drama The Story Lady (1991, with Ed Begley, Jr., Rif Hutton, and Viola Kates Stimpson), and the science fiction film Future Shock (1994, with Scott Thompson, Brian Brophy, Amanda Foreman, David Bowe, and Greg Grunberg). A segment of the latter film was produced by Bryan Burk and featured music by J.J. Abrams.
Lee also had guest roles in episodes of The New Odd Couple (1983, with Ron Glass and Raymond Singer), Throb (1986), Doogie Howser, M.D. (1989, with Lawrence Pressman, James Sikking, and Conroy Gedeon), Jake and the Fatman (1990, with Kathryn Leigh Scott, Branscombe Richmond, Stan Ivar, and George O'Hanlon, Jr.), and Top of the Heap (1991, with Leslie Jordan).
Among her last known appearances is the comedy Always Say Goodbye (1996, with Steven Anderson, Louis Giambalvo, and Richard Tanner) and are two episodes of the remake series Love Boat: The Next Wave (1998, starring Phil Morris and with Dan Sachoff, Cari Shayne, and Michelle Phillips).