Clara Clayton Brown was introduced in the Back to the Future Part III (Amblin & Universal, 1990) live action film, played by Mary Steenburgen. She was also voiced by Steenburgen in the Back to the Future (Amblin & Universal, 1991) animated series.
Clara first appeared in a comic book in Back to the Future Special (Harvey, 1991 series) #[nn] (1991) or Back to the Future (Harvey, 1991 series) #1 (November 1991). It has not yet been determined which was published first, however both issues contain the same story. Clara's backstory was revealed in Back to the Future (IDW, 2015 series) #5 (February 2016).