However, she was also in the service of Lionel Luthor. When it became clear that Lex was coming close to uncovering the truth about his grandparents' deaths, Lionel ordered Dr. Foster to drug Lex, to make it appear that Lex was having a psychotic break. Lex was committed to Belle Reve, under her care, with Lionel ordering her to give him a treatment that would erase the last few weeks from Lex's memory. Clark Kent managed to talk her out of it, but before Dr. Foster was able to prevent Lex from receiving the treatment, she was killed in a car accident.
- Claire Foster was played by Lorena Gale.
- 4 Appearances of Claire Foster (Smallville)
- 2 Images featuring Claire Foster (Smallville)
- Quotations by or about Claire Foster (Smallville)
- Character Gallery: Claire Foster (Smallville)