premise: D.A.R.Y.L. is a 1985 American science fiction film written by David Ambrose, Allan Scott and Jeffrey Ellis. It was directed by Simon Wincer and stars Barret Oliver, Mary Beth Hurt, Michael McKean, Danny Corkill, and Josef Sommer. The original music score was composed by Marvin Hamlisch.
hypothesis: Mary Beth starred in an American science fantasy film.
reason: We do not know whether or not Mary Beth starred in an American science fantasy film based on the statement. D.A.R.Y.L. was NOT that genre, but that doesn't mean she hasn't been in a different movie of that genre.